CN2394379Y - Superbass power amplifier with regulation of upper limit of frequency spectrum - Google Patents
Superbass power amplifier with regulation of upper limit of frequency spectrum Download PDFInfo
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- CN2394379Y CN2394379Y CN 00219402 CN00219402U CN2394379Y CN 2394379 Y CN2394379 Y CN 2394379Y CN 00219402 CN00219402 CN 00219402 CN 00219402 U CN00219402 U CN 00219402U CN 2394379 Y CN2394379 Y CN 2394379Y
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Abstract
The utility model belongs to a device which conducts the power amplification for the super heavy bass. A signal input circuit, a first-level voltage amplifying circuit, a low-pass network circuit, a back-level power amplification circuit and an output circuit of the device are connected in turn, the input end of a volume control circuit is the input end of the low-pass network circuit, the output end of the volume control circuit is connected with a frequency moving circuit, and the output end of the frequency moving circuit is the output end of the low-pass network circuit. When the utility model is used, the device can conduct the adjustment for the upper frequency limit, and the part with high frequency for the super heavy bass is plump. After a network circuit with fixed frequency is installed, the lower frequency limit of the super heavy bass can be limited, and the output effect is further ensured.
Description
The utility model relates to a kind of device that mega bass is carried out power amplification.
The musical sound of the frequency range of the 2-150Hz in the music is powerful extremely important to the performance music.As if lacking the musical sound of this band frequency in the music or can not truly reducing, music can seem that just imposing manner is not enough or stiff.Mega bass is exactly that musical sound with this frequency range significantly promotes, and makes the LF-response expansion.Common mega bass power amplifier device can not be regulated the upper frequency limit of mega bass, the people is sounded seem the higher part of the frequency of mega bass plentiful inadequately.
The purpose of this utility model is, can regulate upper frequency limit when a kind of the use is provided and makes the higher more plentiful mega bass power amplifier device of part of frequency of mega bass.
The technical scheme that realizes the utility model purpose is (referring to Fig. 1 to Fig. 4); This device has signal input and first order voltage amplifier circuit (1), low-pass network circuit (3), back level power amplifier (5), output circuit (7), protective circuit (8) and power circuit (9); The output of power circuit (9) has output matching circuit (71), output on-off circuit (72) and loud speaker (73) with the continuous output circuit (7) of the power end of each relevant circuit of this device; The output termination output on-off circuit (72) of output matching circuit (71), the output termination loud speaker (73) of output on-off circuit (72); Signal input and first order voltage amplifier circuit (1) are provided with audio input port, the audio signal output end of signal input and first order voltage amplifier circuit (1) can connect low-pass network circuit (3), the audio signal output end of low-pass network circuit (3) can connect back level power amplifier (5), the audio signal output end of back level power amplifier (5) connects output circuit (7), the sampled signal output termination protective circuit (8) of back level power amplifier (5), protective circuit (8) are provided with the control piece that can control the break-make of output on-off circuit (72); It is characterized in that: low-pass network circuit (3) has volume control circuit (31) and shift frequency circuit (32), the input of volume control circuit (31) is the input of low-pass network circuit (3), the output termination shift frequency circuit (32) of volume control circuit (31), shift frequency circuit (32) output is the output of low-pass network circuit (3).
Referring to Fig. 3, above-mentioned shift frequency circuit (32) has integrated transporting discharging N3-2, resistance R 24, R27, capacitor C 16, C18, potentiometer RP3-1 and potentiometer RP3-2; R24, RP3-1, RP3-2, R27 links to each other successively, one end of resistance R 24 is the input of shift frequency circuit (32), the common junction of R24 and RP3-1 links to each other with the adjustable end of RP3-1, the common junction of RP3-2 and R27 links to each other with the adjustable end of RP3-2, the in-phase input end of another termination integrated transporting discharging N3-2 of R27, the common junction of RP3-1 and RP3-2 links to each other with the end of C16, the other end of C16 links to each other with the inverting input of integrated transporting discharging N3-2, C18 be connected on and the in-phase input end of integrated transporting discharging N3-2 between, the output of integrated transporting discharging N3-2 links to each other with the inverting input of integrated transporting discharging N3-2, and the output of integrated transporting discharging N3-2 is the output of shift frequency circuit (32).
Referring to Fig. 1, consider and make this device have the function that the lower-frequency limit to mega bass limits, this device also has fixed frequency lattice network (4), fixed frequency lattice network (4) be arranged between signal input and first order voltage amplifier circuit (1) and the low-pass network circuit (3) or low-pass network circuit (3) with afterwards between grade power amplifier (5).
Referring to Fig. 3, said fixing frequency lattice network (4) is made up of integrated transporting discharging N3-1, resistance R 22, R23, R25, R26, capacitor C 160, C17; R26, C16, a C17 end separately links together, and the other end of C17 is the input of fixed frequency lattice network (4), the in-phase input end of another termination integrated transporting discharging N3-1 of C16, the inverting input of another termination integrated transporting discharging N3-1 of R26; R25 and R23 series connection, the output of another termination integrated transporting discharging N3-1 of R25, the other end ground connection of R23, the common junction of R25 and R23 connects the inverting input of integrated transporting discharging N3-1; The end ground connection of R22, the in-phase input end of another termination N3-1 of R22; The output of N3-1 is the output of fixed frequency lattice network (4).
Referring to Fig. 1, consider that the phase place that makes the sound that this device loud speaker broadcasts can conversion, this device also has positive and negative phase commutation circuit (2), positive and negative phase commutation circuit (2) be arranged between signal input and first order voltage amplifier circuit (1) and the low-pass network circuit (3) or low-pass network circuit (3) with afterwards between grade power amplifier (5).
Referring to Fig. 3, above-mentioned positive and negative phase commutation circuit (2) has positive and negative phase switching switch circuit (21), positive inverting amplifier (22) and output coupling circuit (23); The input of positive and negative phase switching switch circuit (21) is the input of positive and negative phase commutation circuit (2), positive and negative phase switching switch circuit (21) is provided with two outputs, the in-phase input end of one of them output positive and negative phase amplifier of termination (22), the inverting input of another output positive and negative phase amplifier of termination (22); The output termination output coupling circuit (23) of positive inverting amplifier (22), the output of output coupling circuit (23) is the output of positive and negative phase commutation circuit (2).
Referring to Fig. 3, above-mentioned positive and negative phase switching switch circuit (21) is a positive and negative switch S 1 of switching mutually, S1 is made up of the either-or switch S11 and the S12 of two interlocks, second input of the first input end of S11 and S12 links to each other, their common junction is the input of positive and negative phase switching switch circuit (21), and second input of S11 and the first input end of S12 be ground connection simultaneously; The output of S11 is the output that the normal phase input end with positive inverting amplifier (22) of positive and negative phase switching switch circuit (21) links to each other, and the output of S12 is the output that the inverting input with positive inverting amplifier (22) of positive and negative phase switching switch circuit (21) links to each other.
Referring to Fig. 3, above-mentioned positive inverting amplifier (22) has integrated transporting discharging N2-1, resistance R 18～R21, capacitor C 13, C14, C24; R20, R21, C14 connect successively, and the other end of C14 is the normal phase input end of positive inverting amplifier (22), and the common junction of R20 and R21 connects the in-phase input end of integrated transporting discharging N2-1, the other end ground connection of R20; R18 and C13 series connection, the other end of C13 is the inverting input of positive inverting amplifier (22), the inverting input of another termination N2-1 of R18; C24 is connected between the in-phase input end and inverting input of N2-1; R19 is connected between the output and inverting input of N2-1; The output of N2-1 is the output of positive inverting amplifier (22).
Referring to Fig. 1 and Fig. 4, consider that this installs less and sound amplitude output of transient distortion in use and does not descend, this device also has regenerative circuit (6); Back level power amplifier (5) has low-pass filter circuit (51), differential amplifier circuit (52), voltage amplifier circuit (53), current amplification circuit (54) and negative-feedback circuit (55); Input that is called first input end in (52) two inputs of the output termination differential amplifier circuit of low-pass filter circuit (51), the output of differential amplifier circuit (52) connects voltage amplifier circuit (53), and the output of voltage amplifier circuit (53) connects current amplification circuit (54); One end of negative-feedback circuit (55) links to each other with the output of current amplification circuit (54), and the other end of negative-feedback circuit (55) links to each other with the first input end of differential amplifier circuit (52); The input of one termination regenerative circuit (6) of loud speaker (73), an input that is called second input of two outputs of the differential amplifier circuit (52) of level power amplifier (5) after the output termination of regenerative circuit (6).
Referring to Fig. 4, above-mentioned regenerative circuit (6) has resistance R 29, R14, capacitor C 21; R29 and R14 series connection, the other end ground connection of R14, C21 is in parallel with R29; The common junction of R29, R14 and C21 is the input of regenerative circuit (6), and the common junction of R29 and C21 is the output of regenerative circuit (6).
The utlity model has positive effect: after the low-pass network circuit of (1) this device is provided with the shift frequency circuit, can carry out manual adjustments to the upper limit of the cut-off frequency of output sound, the above signal of cut-off frequency is attenuated; This device is provided with the fixed frequency lattice network, and the following signal of fixed frequency (about 20Hz) is attenuated, and like this, this device can limit the frequency range of output sound, to reach satisfied output effect.(2) after this device is provided with positive and negative phase commutation circuit, when this device playing back music, phase place are but opposite with main sound channel, then can make phase place identical by the switching of switch with the main sound channel phase place.(3) existing mega bass power amplifier device all is provided with the low-pass network circuit, between the output of its power amplification circuit and the negative input voltage negative feedback circuit is set.This negative-feedback circuit both can increase multiplication factor constancy, reduce nonlinear distortion, can suppress high-frequency noise again.But big loop negative feedback meeting causes transient distortion, especially the transient distortion of locating at the resonance point on frequency-impedance curve (about 30Hz) is more, the carton motion that briefly is exactly drive signal and loud speaker is asynchronous, make the sound sluggishness, unintelligible, big dynamically expressive force is not enough, listens sound quality to descend thereby cause.If reduce negative feedback depth, gain is descended, influence the raising of sound amplitude.The output impedance of present power amplifier is all done smallerly, is far smaller than the equiva lent impedance of loud speaker, and loud speaker can equivalence becomes the series connection form circuit of inductance and resistance.Because the equivalent inductance of loud speaker and resistance be regulation value, can not accomplish not have, so its influence is an objective reality, mainly be that equiva lent impedance by loud speaker causes and cause the reason of transient distortion.The generation of transient distortion is the fundamental characteristics that comes from inductance, and the characteristics of inductance are exactly to hinder the source electromotive force that applies thereon, produce a back electromotive force.The equivalent inductance of loud speaker produces a back electromotive force to music signal, this back electromotive force, be added to front stage circuits by big loop negative feedback, make line transient distortion aggravation, locate near the resonance frequency (30Hz) of loud speaker especially, owing to be series resonance, it is maximum that loop current reaches, more make back electromotive force reach maximum, cause serious transient distortion.The method that addresses this problem is introduced the positive current feedback circuit exactly.From the amplifier stability aspect, positive feedback is disadvantageous, and it causes self-oscillation easily, and just there are destabilizing factors such as distributed capacitance, distributed inductance in circuit own, just more serious in the medium-high frequency amplifying circuit especially, so in alt frequency amplifying circuit, be not adopt regenerative circuit.But in the mega bass amplifying circuit, adopt the possible property of regenerative circuit.At first must guarantee: total positive feedback component must be much smaller than total negative feedback component, amplifier totally is the negative feedback characteristic, the positive feedback component that regenerative circuit produced that is provided with makes a part of having offset the negative feedback component, thereby reaches the purpose that reduces transient distortion.This negative function is obvious especially at the resonance frequency place of loud speaker.At the resonance frequency place of loud speaker, the loud speaker loop current is more not much smaller than resonance point place, and the positive-negative feedback component is reduced much simultaneously, so though positive feedback reduces the effect of transient state still exists, not as embodying obviously at the resonance point place.
Drawing of the present utility model is described as follows:
Fig. 1 is a kind of circuit block diagram of the present utility model.
Fig. 2 is a kind of electrical schematic diagram of power circuit among Fig. 1.
Fig. 3 is a kind of electrical schematic diagram of the front stage circuits among Fig. 1.Front stage circuits comprises signal input and first order voltage amplifier circuit, positive and negative phase commutation circuit, low-pass network circuit and fixed frequency lattice network.
Fig. 4 is a kind of electrical schematic diagram of back level power amplifier, regenerative circuit, output circuit and protective circuit among Fig. 1.
The utility model will be further described below in conjunction with drawings and Examples.
See Fig. 1, Fig. 3 and Fig. 4, this device has signal input and first order voltage amplifier circuit (1), positive and negative phase commutation circuit (2), low-pass network circuit (3), fixed frequency lattice network (4), back level power amplifier (5), regenerative circuit (6), output circuit (7), protective circuit (8) and power circuit (9).Low-pass network circuit (3) has volume control circuit (31) and shift frequency circuit (32), the input of volume control circuit (31) is the input of low-pass network circuit (3), the output termination shift frequency circuit (32) of volume control circuit (31), shift frequency circuit (32) output is the output of low-pass network circuit (3).Back level power amplifier (5) has low-pass filter circuit (51), differential amplifier circuit (52), voltage amplifier circuit (53), current amplification circuit (54) and negative-feedback circuit (55); Input that is called first input end in (52) two inputs of the output termination differential amplifier circuit of low-pass filter circuit (51), the output of differential amplifier circuit (52) connects voltage amplifier circuit (53), the output of voltage amplifier circuit (53) connects current amplification circuit (54), one end of negative-feedback circuit (55) links to each other with the output of current amplification circuit (54), and the other end of negative-feedback circuit (55) links to each other with the first input end of differential amplifier circuit (52).Output circuit (7) has output matching circuit (71), output on-off circuit (72) and loud speaker (73); The output termination output on-off circuit (72) of output matching circuit (71), an end of the output termination loud speaker (73) of output on-off circuit (72); The output of power circuit (9) links to each other with the power end of each relevant circuit of this device, signal input and first order voltage amplifier circuit (1) are provided with audio input port, the audio signal output end of signal input and first order voltage amplifier circuit (1) connects positive and negative phase commutation circuit (2), the output of positive and negative phase commutation circuit (2) connects low-pass network circuit (3), the audio signal output end of low-pass network circuit (3) connects fixed frequency lattice network (4), the output of fixed frequency lattice network (4) connects back level power amplifier (5), the audio signal output end of back level power amplifier (5) connects output circuit (7), another termination regenerative circuit (6) of the loud speaker (73) of output circuit (7), an input that is called second input of two outputs of the differential amplifier circuit (52) of level power amplifier (5) after the output termination of regenerative circuit (6); The output termination protective circuit (8) of the output matching circuit (71) of output circuit (7), protective circuit (8) are provided with can be to the control piece controlled of break-make of output on-off circuit (72).
See Fig. 2, power circuit (9) is made up of civil power input and transformer circuit (91), first group of dc power generating circuit (92) and second group of dc power generating circuit (93).The civil power of alternating current 220V 50Hz is added to the elementary of transformer T1 through the switch S 2 of civil power input and transformer circuit (91), and T1 time level has two groups of winding: AC30V, AC16V.AC30V is through the N4 bridge rectifier of first group of dc power generating circuit (92), and again through the big capacitor filtering of C42, C43, the direct voltage about generation ± 40V provides abundant power supply for back level power amplifier.C44, C45, C40, C41 are anti-interference capacitor.AC16V is through VD13, the VD12 of second group of dc power generating circuit (93), the bridge rectifier rectification that VD14, VD15 form, produce the bigger positive and negative voltage of ripple respectively through C48, C49 filtering again, positive voltage is 7812 the less stable+12V voltage of three terminal regulator N5 output ripple through model.Negative voltage is 7912 the less stable-12V voltage of three terminal regulator N6 output ripple through model.± 12V provides power supply to front stage circuits.C50, C51 are anti-interference capacitor.
See Fig. 3, signal input and first order voltage amplifier circuit (1) are made up of input signal interface circuits (11), voltage amplifier circuit (12) and output coupling circuit (13).Audio signal is inserted by the input jack X1 of input signal interface circuits (11), and through the resistance R 01 of voltage amplifier circuit (12), again through capacitor C 01 coupling, being added to model is 6 pin of the integrated transporting discharging N1-2 of MC4558; Resistance R 04 and capacitor C 02 are connected between the output and inverting input of N1-2 simultaneously, R04, C02 and N1-2 form the single order low pass first order voltage amplifier of holding concurrently, attenuation characteristic is-the 20dB/10 octave that audio signal exports positive and negative phase commutation circuit (2) to by capacitor C 03 coupling of output coupling circuit (13) behind N1-2.
Positive and negative phase commutation circuit (2) is made up of positive and negative phase switching switch circuit (21), positive inverting amplifier (22) and output coupling circuit (23).Positive and negative phase switching switch circuit (21) positive and negative switched switch S 1 mutually and is made up of the either-or switch S11 and the S12 of two interlocks, second input of the first input end of S11 and S12 links to each other, their common junction is the input of positive and negative phase switching switch circuit (21), and second input of S11 and the first input end of S12 be ground connection simultaneously; The output of S11 is the output that the normal phase input end with positive inverting amplifier (22) of positive and negative phase switching switch circuit (21) links to each other, and the output of S12 is the output that the inverting input with positive inverting amplifier (22) of positive and negative phase switching switch circuit (21) links to each other.Positive inverting amplifier (22) has integrated transporting discharging N2-1, resistance R 18～R21, capacitor C 13, C14, the C24 that model is MC4558; R20, R21, C14 connect successively, and the other end of C14 is the normal phase input end of positive inverting amplifier (22), and the common junction of R20 and R21 connects the in-phase input end of integrated transporting discharging N2-1, the other end ground connection of R20; R18 and C13 series connection, the other end of C13 is the inverting input of positive inverting amplifier (22), the inverting input of another termination N2-1 of R18; C24 is connected between the in-phase input end and inverting input of N2-1; R19 is connected between the output and inverting input of N2-1; The output of N2-1 is the output of positive inverting amplifier (22).
Audio signal is added to the positive and negative input that switches switch S 1 mutually of positive and negative phase switching switch circuit (21), after S1 conversion, be added to positive inverting amplifier (22).When S11 pushes first input end, S12 pushes second input, then audio signal is added to 5 pin of N2-1 by C14, R21, and 6 pin of N2-1 are through R18, C13 ground connection simultaneously, and whole is 1: 1 amplifier.When S11 and S12 pulled out the other end, audio signal was by C13, and the R18 coupling is added to 6 pin of N2-1, and 5 pin of N2-1 are through R21 simultaneously, and C14 ground connection also constitutes 1 amplifier of 1: 1.But under two kinds of situations, variation has taken place in positive antiphase, thereby reaches different effects.The signal of N2-1 output is transported to low-pass network circuit (3) after the C06 of output coupling circuit (23) coupling.
Low-pass network circuit (3) is made up of volume control circuit (31) and shift frequency circuit (32).Volume control circuit (31) is volume potentiometer RP2, and the total resistance of RP2 is 5K Ω, and the parallel connection value of it and source impedance is smaller, and the low-pass network characteristic to the back level influences less.RP2 control volume is added to shift frequency circuit (32).Shift frequency circuit (32) has integrated transporting discharging N3-2, resistance R 24, R27, capacitor C 16, C18, the potentiometer RP3 (containing RP3-1 and RP3-2) that model is MC4558; R24, RP3-1, FP3-2, R27 links to each other successively, one end of resistance R 24 is the input of shift frequency circuit (32), the common junction of R24 and RP3-1 links to each other with the adjustable end of RP3-1, the common junction of RP3-2 and R27 links to each other with the adjustable end of RP3-2, the in-phase input end of another termination integrated transporting discharging N3-2 of R27, the common junction of RP3-1 and RP3-2 links to each other with the end of C16, the other end of C16 links to each other with the inverting input of integrated transporting discharging N3-2, C18 be connected on and the in-phase input end of integrated transporting discharging N3-2 between, the output of integrated transporting discharging N3-2 links to each other with the inverting input of integrated transporting discharging N3-2, and the output of integrated transporting discharging N3-2 is the output of shift frequency circuit (32).Shift frequency circuit (32) is one two a rank low-pass network.This network is made of integrated transporting discharging N3-2, resistance R 24 (3.3K Ω), R27 (3.3K Ω), potentiometer RP3-1, RP3-2, capacitor C 16 (0.684 μ F), C18 (0.164 μ F).RP3 is a two-way 10K Ω potentiometer, regulates the cut-off frequency point that RP3 can change low-pass network, and clockwise direction revolves, and rises by ending Frequency point; Counterclockwise revolve, cut-off frequency point descends.Wherein: cut-off frequency f (3)=1/[2 π (R24+RP3)
Attenuation characteristic is-the 40dB/10 octave.
The audio signal of shift frequency circuit (32) output is transported to fixed frequency lattice network (4) by 7 pin of integrated transporting discharging N3-2.
Fixed frequency lattice network (4) is a second order high pass network, and this network is that integrated transporting discharging N3-1, resistance R 22 (56K Ω), R23 (22K Ω), R25 (22K Ω), R26 (22K Ω), capacitor C 160 (0.224 μ F), the C17 (0.224 μ F) of MC4558 forms by fixed frequency lattice network (4) by model; R26, C16, a C17 end separately links together, and the other end of C17 is the input of fixed frequency lattice network (4), the in-phase input end of another termination integrated transporting discharging N3-1 of C16, the inverting input of another termination integrated transporting discharging N3-1 of R26; R25 and R23 series connection, the output of another termination integrated transporting discharging N3-1 of R25, the other end ground connection of R23, the common junction of R25 and R23 connects the inverting input of integrated transporting discharging N3-1; The end ground connection of R22, the in-phase input end of another termination N3-1 of R22; The output of N3-1 is the output of fixed frequency lattice network (4).The position of resistance and electric capacity is just in time opposite with low-pass network in this network, mainly following signal about 20Hz is decayed.Its cut-off frequency: f (3)=1/[2 π C17
, attenuation characteristic is-the 40dB/10 octave.The mega bass audio signal of fixed frequency lattice network (4) output is transported to back level power amplifier (5) by 1 pin of integrated transporting discharging N3-1.
See Fig. 4, the mega bass audio signal adds to the low-pass filter circuit of being made up of capacitor C 23 and resistance R 32 (51) of back level power amplifier (5).The triode V01 of differential amplifier circuit (52) and V03 constitute differential pair, to improving the stability and the signal to noise ratio of amplifying certain effect are arranged all; Resistance R 31, capacitor C 22 are formed phase compensating circuit, and triode V04, V05 and resistance R 33, R35 are the collector load biasing resistor of differential pair tube; Triode V02, resistance R 30, diode VD01 and VD02 constitute constant-current source and hold more than one job currently branch to the emitter-base bandgap grading biasing circuit, and resistance R 70 is a biasing resistor.Transport to base stage behind the audio signal process low-pass filter circuit (51) as the triode V03 of differential amplifier circuit (52) first input end, collector electrode output by V03, transport to voltage amplifier circuit (53) triode V08 through triode V04 successively, triode V08 carries out voltage amplification to signal, resistance R 39 is biasing, the current-limiting resistance of triode, and C27 is for eliminating the feedback capacity of high-frequency self-excitation; Diode VD03, VD04, potentiometer RP1, resistance R 38, triode V07 constitute dynamic bias circuit, V07 raises with temperature, and b, e junction voltage Vbe rise, and causes integrated electrode current IC to rise, to the shunting of back level base current, thereby reach the purpose of dynamic adjustment.Adjust the quiescent point that RP1 can change V07, thereby change back level output quiescent current.The resistance R 41 of current amplification circuit (54), R44 are back level biasing resistor, and triode V09, V10 and V11, V12 constitute two groups of reverse Darlington transistors, signal is carried out electric current amplify, and finish whole power amplification; R42 is a biasing resistor, and R46, R49 are the emitter-base bandgap grading output resistance.Negative-feedback circuit (55) is made up of capacitor C 24, C26, resistance R 34, R37, and the common junction of R34 and R37 links to each other with the first input end of differential amplifier circuit (52), and the feedback factor of negative-feedback circuit (55) has determined the gain of whole back level amplifying circuit.
The audio signal of back level power amplifier (5) output after power amplification is to the output matching circuit (71) of output circuit (7).Output matching circuit (71) is made up of capacitor C 32, resistance R 43, R48 and inductance L 1, and capacitor C 32 and resistance R 43 constitute phase compensating circuit, and L1 and R48 play weakening and high-frequency choke effect to output signal.The mega bass audio signal of output matching circuit (71) output is to exporting on-off circuit (72), and output on-off circuit (72) is made of the K switch 1-1 of relay, and the break-make of K1-1 is to be controlled by the relay coil K1-2 in the protective circuit (8).To loud speaker (73), play mega bass through the exportable big voltage of relay switch K1-1, big current signal.
The input of another termination regenerative circuit (6) of loud speaker (73), the input that is called second input of two outputs of the differential amplifier circuit (52) of level power amplifier (5) that is the base stage of triode V01 after the output termination of regenerative circuit (6); Regenerative circuit (6) has resistance R 29, R14, capacitor C 21; R29 and R14 series connection, the other end ground connection of R14, C21 is in parallel with R29; The common junction of R29, R14 and C21 is the input of regenerative circuit (6), and the common junction of R29 and C21 is the output of regenerative circuit (6).
The B4 signal is coupled through C23, and the R32 current limliting is added to the base stage as the reversed-phase output triode V03 of differential pair power amplifier.If the B4 phase place is for just, the V03 base stage just also should be, and the V03 current collection is very negative, and V05, V04 base stage are for negative, the V04 current collection very just, the V08 base stage is for just, and the V08 current collection is very negative, and V11, V12 base stage are for negative, V11, V12 emission is very negative, be output as negatively, promptly total amplifier is an inverting amplifier, so the negative feedback branch road that R37, C26, R34, C24 constitute.
If the V01 base stage is for just, the V01 current collection is very negative, and the V08 base stage is for negative, the V08 current collection very just, V11, V12 base stage, emission very just just are output as, the component of promptly transporting to V01 is the positive feedback component, C21, R29, C20, R28 are just dividing to present the component place in circuit.The positive feedback component of V01 base stage should be much smaller than the negative feedback component of V03 base stage.
Loud speaker SPEAKER and resistance R 14 series connection, the high-power mega bass signal of another termination input of loud speaker, draw the positive feedback component from the common junction of loud speaker and resistance R 14, be added to the base stage of the triode V01 of differential amplifier circuit (52), the anti-phase termination negative feedback component of differential pair.Resonance frequency place at loud speaker, it is maximum that back flow current reaches, make the voltage on the R14 reach maximum, the component of negative feedback simultaneously also reaches maximum, because it is very higher than (CMRR) that the common mode of differential pair circuit is restrained, and makes the positive-negative feedback component offset a part, thereby reach the purpose that reduces transient distortion, if there is not the positive feedback component, transient distortion is not just restrained fully.At the resonance frequency place of loud speaker, the loud speaker loop current is more not much smaller than resonance point place, and the positive-negative feedback component is reduced much simultaneously, and the effect that positive feedback reduces transient state still exists, but obvious not as what embody at the resonance point place.
Protective circuit (8) is made up of testing circuit (81) and output on-off control circuit (82).R83, the C34 of testing circuit (81), C35, R51, V13, V14 form the DC level testing circuit, when in the signal of output matching circuit (71) output DC level being arranged, then this DC level is after R83, R51 dividing potential drop, if surpass conduction level (the positive potential V13 conducting of V13 or V14, negative potential V14 conducting), then the b of V13 and one of V14, R52, V16, branch road that the e structure becomes have electric current to flow through, make the V16 saturation conduction, A3 (+40V) voltage is through the R81 current limliting, and C39 filtering is added to the emitter of V16.R56 is a biasing resistor, and C37 is a faulty action preventing electric capacity.The emitter voltage of V16 removes the voltage that saturation voltage drop is exactly a collector electrode; this voltage makes the V17 conducting through the R57 current limliting, and the V17 current collection is electronegative potential very, and make then that V18 ends, relay coil K1-2 tripping this moment; thereby control relay K switch 1-1 disconnects, the protection loud speaker.C38 is a faulty action preventing electric capacity.When in the signal of output matching circuit (71) output during no DC level, V13, V14, V16, V17 all end, A3 (+40V) to make the base stage of V18 through R81, R80 be high potential, make the V18 conducting, relay coil be in electricity condition, make the relay switch adhesive, allow the mega bass signal reach loud speaker (73).
Embodiment 2,
All the other are identical with embodiment 1, difference is: the audio signal output end of signal input and first order voltage amplifier circuit (1) connects low-pass network circuit (3), the audio signal output end of low-pass network circuit (3) connects positive and negative phase commutation circuit (2), the output termination fixed frequency lattice network (4) of positive and negative phase commutation circuit (2).
Embodiment 3,
All the other are identical with embodiment 1, difference is: the audio signal output end of signal input and first order voltage amplifier circuit (1) connects low-pass network circuit (3), the audio signal output end of low-pass network circuit (3) connects fixed frequency lattice network (4), the output of fixed frequency lattice network (4) connects positive and negative phase commutation circuit (2), level power amplifier (5) after the output termination of positive and negative phase commutation circuit (2).
Embodiment 4,
All the other are identical with embodiment 1, difference is: the audio signal output end of positive and negative phase commutation circuit (2) connects fixed frequency lattice network (4), the output of fixed frequency lattice network (4) connects low-pass network circuit (3), and the audio signal output end of low-pass network circuit (3) connects back level power amplifier (5).
Embodiment 5,
All the other are identical with embodiment 1, difference is: the audio signal output end of signal input and first order voltage amplifier circuit (1) connects fixed frequency lattice network (4), the output of fixed frequency lattice network (4) connects positive and negative phase commutation circuit (2), the output termination low-pass network circuit (3) of positive and negative phase commutation circuit (2), the audio signal output end of low-pass network circuit (3) connect back level power amplifier (5).
All the other are identical with embodiment 1, difference is: the audio signal output end of signal input and first order voltage amplifier circuit (1) connects fixed frequency lattice network (4), the output of fixed frequency lattice network (4) connects low-pass network circuit (3), the audio signal output end of low-pass network circuit (3) connects positive and negative phase commutation circuit (2), level power amplifier (5) after the output termination of positive and negative phase commutation circuit (2).
Claims (10)
1, a kind of mega bass power amplifier device that can regulate upper frequency limit has signal input and first order voltage amplifier circuit (1), low-pass network circuit (3), back level power amplifier (5), output circuit (7), protective circuit (8) and power circuit (9); The output of power circuit (9) links to each other with the power end of each relevant circuit of this device; Output circuit (7) has output matching circuit (71), output on-off circuit (72) and loud speaker (73); The output termination output on-off circuit (72) of output matching circuit (71), the output termination loud speaker (73) of output on-off circuit (72); Signal input and first order voltage amplifier circuit (1) are provided with audio input port, the audio signal output end of signal input and first order voltage amplifier circuit (1) can connect low-pass network circuit (3), the audio signal output end of low-pass network circuit (3) can connect back level power amplifier (5), the audio signal output end of back level power amplifier (5) connects output circuit (7), the sampled signal output termination protective circuit (8) of back level power amplifier (5), protective circuit (8) are provided with the control piece that can control the break-make of output on-off circuit (72); It is characterized in that: low-pass network circuit (3) has volume control circuit (31) and shift frequency circuit (32), the input of volume control circuit (31) is the input of low-pass network circuit (3), the output termination shift frequency circuit (32) of volume control circuit (31), shift frequency circuit (32) output is the output of low-pass network circuit (3).
2, the mega bass power amplifier device that can regulate upper frequency limit according to claim 1, it is characterized in that: shift frequency circuit (32) has integrated transporting discharging N3-2, resistance R 24, R27, capacitor C 16, C18, potentiometer RP3-1 and potentiometer RP3-2; R24, RP3-1, RP3-2, R27 links to each other successively, one end of resistance R 24 is the input of shift frequency circuit (32), the common junction of R24 and RP3-1 links to each other with the adjustable end of RP3-1, the common junction of RP3-2 and R27 links to each other with the adjustable end of RP3-2, the in-phase input end of another termination integrated transporting discharging N3-2 of R27, the common junction of RP3-1 and RP3-2 links to each other with the end of C16, the other end of C16 links to each other with the inverting input of integrated transporting discharging N3-2, C18 be connected on and the in-phase input end of integrated transporting discharging N3-2 between, the output of integrated transporting discharging N3-2 links to each other with the inverting input of integrated transporting discharging N3-2, and the output of integrated transporting discharging N3-2 is the output of shift frequency circuit (32).
3, the mega bass power amplifier device that can regulate upper frequency limit according to claim 1 and 2, it is characterized in that: this device also has fixed frequency lattice network (4), fixed frequency lattice network (4) be arranged between signal input and first order voltage amplifier circuit (1) and the low-pass network circuit (3) or low-pass network circuit (3) with afterwards between grade power amplifier (5).
4, the mega bass power amplifier device that can regulate upper frequency limit according to claim 3, it is characterized in that: fixed frequency lattice network (4) is made up of integrated transporting discharging N3-1, resistance R 22, R23, R25, R26, capacitor C 160, C17; R26, C16, a C17 end separately links together, and the other end of C17 is the input of fixed frequency lattice network (4), the in-phase input end of another termination integrated transporting discharging N3-1 of C16, the inverting input of another termination integrated transporting discharging N3-1 of R26; R25 and R23 series connection, the output of another termination integrated transporting discharging N3-1 of R25, the other end ground connection of R23, the common junction of R25 and R23 connects the inverting input of integrated transporting discharging N3-1; The end ground connection of R22, the in-phase input end of another termination N3-1 of R22; The output of N3-1 is the output of fixed frequency lattice network (4).
5, the mega bass power amplifier device that can regulate upper frequency limit according to claim 3, it is characterized in that: this device also has positive and negative phase commutation circuit (2), positive and negative phase commutation circuit (2) be arranged between signal input and first order voltage amplifier circuit (1) and the low-pass network circuit (3) or low-pass network circuit (3) with afterwards between grade power amplifier (5).
6, the mega bass power amplifier device that can regulate upper frequency limit according to claim 5 is characterized in that: positive and negative phase commutation circuit (2) has positive and negative phase switching switch circuit (21), positive inverting amplifier (22) and output coupling circuit (23); The input of positive and negative phase switching switch circuit (21) is the input of positive and negative phase commutation circuit (2), positive and negative phase switching switch circuit (21) is provided with two outputs, the in-phase input end of one of them output positive and negative phase amplifier of termination (22), the inverting input of another output positive and negative phase amplifier of termination (22); The output termination output coupling circuit (23) of positive inverting amplifier (22), the output of output coupling circuit (23) is the output of positive and negative phase commutation circuit (2).
7, the mega bass power amplifier device that can regulate upper frequency limit according to claim 6, it is characterized in that: positive and negative phase switching switch circuit (21) is a positive and negative switch S 1 of switching mutually, S1 is made up of the either-or switch S11 and the S12 of two interlocks, second input of the first input end of S11 and S12 links to each other, their common junction is the input of positive and negative phase switching switch circuit (21), and second input of S11 and the first input end of S12 be ground connection simultaneously; The output of S11 is the output that the normal phase input end with positive inverting amplifier (22) of positive and negative phase switching switch circuit (21) links to each other, and the output of S12 is the output that the inverting input with positive inverting amplifier (22) of positive and negative phase switching switch circuit (21) links to each other.
8, the mega bass power amplifier device that can regulate upper frequency limit according to claim 6, it is characterized in that: positive inverting amplifier (22) has integrated transporting discharging N2-1, resistance R 18～R21, capacitor C 13, C14, C24; R20, R21, C14 connect successively, and the other end of C14 is the normal phase input end of positive inverting amplifier (22), and the common junction of R20 and R21 connects the in-phase input end of integrated transporting discharging N2-1, the other end ground connection of R20; R18 and C13 series connection, the other end of C13 is the inverting input of positive inverting amplifier (22), the inverting input of another termination N2-1 of R18; C24 is connected between the in-phase input end and inverting input of N2-1; R19 is connected between the output and inverting input of N2-1; The output of N2-1 is the output of positive inverting amplifier (22).
9, the mega bass power amplifier device that can regulate upper frequency limit according to claim 3, it is characterized in that: this device also has regenerative circuit (6); Back level power amplifier (5) has low-pass filter circuit (51), differential amplifier circuit (52), voltage amplifier circuit (53), current amplification circuit (54) and negative-feedback circuit (55); Input that is called first input end in (52) two inputs of the output termination differential amplifier circuit of low-pass filter circuit (51), the output of differential amplifier circuit (52) connects voltage amplifier circuit (53), and the output of voltage amplifier circuit (53) connects current amplification circuit (54); One end of negative-feedback circuit (55) links to each other with the output of current amplification circuit (54), and the other end of negative-feedback circuit (55) links to each other with the first input end of differential amplifier circuit (52); The input of one termination regenerative circuit (6) of loud speaker (73), an input that is called second input of two outputs of the differential amplifier circuit (52) of level power amplifier (5) after the output termination of regenerative circuit (6).
10, the mega bass power amplifier device that can regulate upper frequency limit according to claim 9, it is characterized in that: regenerative circuit (6) has resistance R 29, R14, capacitor C 21; R29 and R14 series connection, the other end ground connection of R14, C21 is in parallel with R29; The common junction of R29, R14 and C21 is the input of regenerative circuit (6), and the common junction of R29 and C21 is the output of regenerative circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00219402 CN2394379Y (en) | 2000-02-18 | 2000-02-18 | Superbass power amplifier with regulation of upper limit of frequency spectrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00219402 CN2394379Y (en) | 2000-02-18 | 2000-02-18 | Superbass power amplifier with regulation of upper limit of frequency spectrum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2394379Y true CN2394379Y (en) | 2000-08-30 |
Family
ID=33584596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00219402 Expired - Fee Related CN2394379Y (en) | 2000-02-18 | 2000-02-18 | Superbass power amplifier with regulation of upper limit of frequency spectrum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2394379Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777878B (en) * | 2009-12-29 | 2012-10-03 | 北京衡天北斗科技有限公司 | Power amplifier for outputting bandwidth large current |
| CN107182001A (en) * | 2017-04-16 | 2017-09-19 | 廖华勇 | The constant technology of multimedia equipment self feed back volume |
| CN112036870A (en) * | 2020-08-27 | 2020-12-04 | 武汉奇致激光技术股份有限公司 | Non-contact IC card for playing audio and control method |
-
2000
- 2000-02-18 CN CN 00219402 patent/CN2394379Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777878B (en) * | 2009-12-29 | 2012-10-03 | 北京衡天北斗科技有限公司 | Power amplifier for outputting bandwidth large current |
| CN107182001A (en) * | 2017-04-16 | 2017-09-19 | 廖华勇 | The constant technology of multimedia equipment self feed back volume |
| CN112036870A (en) * | 2020-08-27 | 2020-12-04 | 武汉奇致激光技术股份有限公司 | Non-contact IC card for playing audio and control method |
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