CN2293885Y - Recording & playing acoustics with new circuit - Google Patents

Abstract

The utility model relates to a recording and playing acoustics with a new circuit, composed of a pre-processing circuit, a bias loop, a delay loop and karaoke circuit, a three-way balance tone, a volume regulation circuit, a power amplification power supply circuit and a frequency spectrum display device. The utility model is characterized in that the utility model inputs signal and frequency network through the conversion three switches, and a pre-circuit IC < 1 > is connected with an IC < 2 > and delay devices IC < 3 >, IC< 4 >. K < 4-2 > are controlled to turn on and off, and the amplified signal can be separately completed. The recording and the playing circuits has same circuits A, B, C and D, and the stereo signal which is output by the utility model enters an F power amplification circuit, a G power amplification circuit and an output sound box. The front of the power amplifiers has balancing, tone and volume regulation circuits.

Description

A kind of record, put the novel circuit sound equipment

The utility model relates to a kind of circuit sound-producing appliance product, belongs to the sound equipment of record, the multi-functional different-effect sound source attention in discharge road specifically.

The reference technique file on existing record, discharge road has: " radio cassette player televisor integrated circuit replacement hand changes " scientific and technical literature publishing house; " boxlike videocorder service technique " Shandong science tech publishing house; " radio " 90 o. 11th People's Telecon Publishing Houses.

The purpose of this utility model is to provide a kind of novel recording playback novel circuit sound equipment.

This practical circuit is to preposing signal process circuit, magnetic bias loop by magnetic head, CD radio reception, PHONO output signal; The double Karaoke of timing circuit circuit, sound equipment, volume control circuit, power amplifier, power circuit, frequency spectrum display device etc. are partly formed.

This reality is novel to be with an integrated package Ic ₁TA7663, has solved A card signal, electret microphone signal, by nine dpdt double-pole double-throw (DPDT) playback switch K at B card signal, radio reception signal, CD signal, PHONO signal, line input signal ₁, double-point double-throw switch K ₂, double-pole four throw switch K ₃Converted input signal realizes record or puts four tunnel output functions and bifrequency turnover corrective network, connect the time-delay BBD device that echoes, realize the stereo record of direct signal/put and have the function selecting that echoing time-delay letter joint stereo is recorded/put, except that the electret microphone recording, need turn down volume potentiometer, more than other signal in when recording, not influenced by it and have monitor function, during the playback of A card, the signal of can playing Karaoka simultaneously vocal accompaniment, the B card also can be edited recording simultaneously, Karaoke socket CK ₃, CK ₄By electronic switch have both " circuit output " socket, signal amplitude is adjustable; During playback; in pairs through stereophonic signal power amplifier is arranged; other is furnished with the power amplifier that echoes of delaying time; and three road direct signal stereo function are selected; the balance volume adjusted in concert is expanded stereo function in addition and is selected, respectively audio amplifier of Lian Jieing and holding circuit thereof between the power amplifier; inner structure loudspeaker multiple-unit does not better have frequency divider coupling, the sound reproduction that the distortion power consumption is little.

Fig. 1 is for recording, put circuit diagram.

Further specify below in conjunction with accompanying drawing:

7. and 10. 1, preposing signal process circuit: an integrated package TA7668 is only used on whole preposition road, and shared two input ports are pin, pass through K respectively ₂Double-point double-throw switch conversion A card/B screens signal, K ₃Tape, radio reception, CD, PHONO position signal are selected in the conversion of double-pole four throw switches, pass through K ₁The K of 9 dpdt double-pole double-throw (DPDT) playback switch _1-2, K _1-4Finish the signal of electret microphone, " circuit input " during the recording position, K _1-5, K _1-6, K _1-7, K _1-8Finish record, put corrective network, the two corner frequencies of playback compensation are 48.25HZ and 1343HZ, 0 decibel of frequency response 30～14KHZ of recording compensation also passes through K _1-1, K _1-2The conversion magnetic head lead signal connects bias current, carries out the interior record of A card and other signal and B card.Playback/recording output has (5), (12), (4), (13) pin four tunnel signal application.

2, magnetic bias loop: single tube vibration, oscillation frequency f ₀=1/2 π LC, stack C road, the through stereophonic signal recording in D road in the bias current, or the recording of the response signal of stack time-delay therein, two kinds of functions, other has characteristics is to amplify Ic after trapper is located at C road and D road and time delay device _2-4Between the output, and identical with oscillation frequency.

3, timing circuit has both the Karaoke circuit: this part is by Microphone for karaoke double socket CK ₃, CK ₄, two volume potentiometers are regulated W ₁, W ₂, transistor T ₁And T ₁Amplify, on collector output signal and front end circuit output A road and B road, through shunt resistance R ₁, resistance R ₂Import the S point, constitute the Karaoke circuit part, enter shared four computing ic chips ₂TL084, IC _2-1Amplify IC _2-3The time delayed signal that LPF filtering time delay device produces, IC _2-2Amplify IC repeatedly ₃MN3207, IC ₄The time delayed signal that M N3102 produces constitutes whole signal source when recording or putting, and obtains the time delayed signal that echoes of special-effect, is provided with the degree of depth potentiometer W that echoes ₃, IC _2-4Mix to amplify three road identical signals of output, constitute timing circuit, wherein two-way respectively with the C road and the D road of front end circuit, through the connection of trapper anti-crosstalk, constitute the two reverse channel functions of recording playback, another road enters tone circuit E road power amplifier, this time delay device core I C ₃, IC ₄, adopt anti-electromagnetic radiation metallic shield grounding measures, adopt independent electronic filter power supply, the entire circuit power supply is provided with K switch 4-2 control, realizes having the stereo record of direct signal/put and have the function selecting control that the stereo level sense of echoing is recorded/put.

Set up " circuit output " function of socket,, and cooperate on the market " game machine home computer " to have both two jack design of Karaoke to have " circuit output " semiotic function, only need respectively on A road and B road, set up D for the panel consideration of arranging ₁, T ₃, D ₂, T ₄, T ₃, T ₄Base stage be connected with preposition TA7668 (14), (3) pin, (15) pin is subjected to K switch _4-1Control constitutes electronic switch control circuit, when (15) pin is noble potential, is exactly the circuit output function, W ₁, W ₂Just become output amplitude and adjust potentiometer, during electronegative potential, effectively preventing crosstalks is exactly that the function of socket of playing Karaoka can be sung, with K _4-2Switch connection BBD device power source sync bit.K _4-1, K _4-2Adopt double-pole throw switch or independent switch control respectively.

4, three tunnel balances, tone, volume control circuit: three road balanced potentiometers designs before each tone circuit or behind the tone circuit all can, be coaxial three potentiometer W ₄, W ₅, W ₆Input signal, W ₄, W ₆Two ends, left and right sides homophase and W ₅The anti-phase connection in two ends, the left and right sides, utilize the obtained resistance value of three potentiometers to carry out linear regulation during rotation, control three tunnel balances, the center tap output signal is respectively the input end on F road, E road, G road, and tone circuit can be designed to the higher frequency equilibrium regulating circuit of attenuation type or negative feedback or quality.

5, power amplifier: power amplifier 1 and power amplifier 3, be furnished with one tunnel power amplifier that echoes time delayed signal, the power amplifier worker, integrated package is preferably selected for use and is had the noise elimination function, as for power, selects for use the different capacity integrated package to cooperate power supply, and different three tunnel identical power are just arranged.Also can also can be designed to the corresponding identical power amplifier 1 of multichannel, power amplifier 2, power amplifier 3 according to the expansion needs.Select 12W for use, the TDA2006 integrated package, in the time of can being designed to O CL or OTL circuit, also can set up stereo expanded function, promptly take out feedback signal from output terminal separately, be input between another road power amplifier end of oppisite phase or input in addition between two road power amplifier end of oppisite phase, or to adopt another kind of form be that end of oppisite phase is separately controlled by switch.

6, audio amplifier

Audio amplifier inner structure type of attachment is selected according to class according to quality:

1), 4 Ω, 10W cone loudspeaker, 6dB frequency divider series connection high pitch cone 4 Ω in parallel, 2W.

2), adopt the low-resistance cone loudspeaker, remove the inductance frequency division, reduce the distortion power consumption and improve speaker performance frequency utilization is arranged, avoid the improper performance that causes of part-frequency point to descend, as 8 Ω basses and 8 Ω middle pitch cone loudspeakers and be unified into 4 Ω, each 5W, 6dB frequency divider series connection high pitch cone 4 Ω in parallel, 2W, if not strong enough at the audition alt, available two 8 Ω, 1W, the impedance high pitch also is connected into 4 Ω, improves the high pitch composition.

3) according to W=IU=I ²Z=U ²/ Z calculates the actual partial current of the loudspeaker that flows through each branch road and is as the criterion less than the rated current of selecting the rated power of loudspeaker, designs the connection of various unit speaker.Originally for example down: general power 12W, power supply power amplifier typical case 12V power supply, Z ₁=8 Ω, 5W, bass Z in parallel ₂=8 Ω, 5W, middle pitch cone loudspeaker, I _{1 is real}=I _{2 is real}=0.75A＜I _{1 volume}=I _{2 volumes}-0.79A, two 1.5W in parallel again, Z ₃=Z ₄=8 Ω series connection, I _{3 is real}=IC _{4 is real}=0.38A＜I _{3 volumes}=I _{4 volumes}=0.433A, resulting impedance 3.2 Ω realize the connection of no frequency divider, improve whole signal equalization amplitude playback efficient.

Design audio amplifier 1, audio amplifier 2, audio amplifier 3 structure same host shells divide the body structure console mode, or the split combined structure is desk-top, or audio amplifier 1, audio amplifier 3 and main case split, the loudspeaker of audio amplifier 2 is contained in the host shell, and it number is 95218586.5 structure of loudspeaker that domestic applications are preferably adopted in dress loudspeaker suggestion within it.

7, power circuit

Power transformer secondary has two loops, power amplifier is supplied with in a loop full-bridge rectification filtering separately, obtain dynamically big, acoustic frequency response, another full-bridge filter circuit provides front end circuit, motor circuit, CD, PHONO, radio reception signal circuit, the double Karaoke of timing circuit circuit, frequency spectrum demonstration and other circuit are shared.

8, frequency spectrum display device

Take to take out signal, enter frequency spectrum display lamp device from the power amplifier output.

The whole loop of playback signal is as follows:

When B was stuck in playback, L, (R) road magnetic head signal were by playback switch K _1-2, (K _1-4) the playback position, K _2-1, (K _2-2) B screens, K _3-1, (K _3-2) the tape position, enter (10), [7.] pin of TA7668, amplify balanced from (12), [5.] pin output B, (A) road, (13), [4.] pin output D, (C) road, the through separately W in B, (A) road ₄, (W ₆), tone, volume, power amplifier (1), [3.] are amplified.

Claims (5)

1,1. a kind of record, the composition of putting the novel circuit sound equipment comprise preposing signal process circuit, 2. magnetic bias loop, 3. hold concurrently Karaoke circuit, 4. three tunnel balance tones, volume control circuit, 5. power amplifier, 6. power circuit, 7. frequency spectrum display device of timing circuit, it is characterized in that passing through K switch ₁, K ₂, K ₃Converted input signal and frequency compensation network are with same principle front end circuit IC ₁Connect IC ₂With time delay device IC ₃, IC ₄, control K _4-2Switch, just finish respectively and want amplifying signal to have the stereo and joint stereo recording playback selection of echoing of direct signal, record/put, identical A road is arranged, identical B road, identical C road, identical D road, signal output is used, wherein have paired stereo direct signal F road advance power amplifier 1., 3. the G road advance power amplifier, be furnished with through R ₁, R ₂Shunting signal meets at the S point, this point also can simultaneously or be imported Microphone for karaoke, accompaniment signal separately, after importing shared timing circuit, record/put two reverse with C road, D road through the trapper channel signal, mix after power amplifier is advanced in the E road 2., balance, tone, volume control circuit are arranged before each power amplifier, the stereo selection of expansion is arranged between the power amplifier, each power amplifier is furnished with electroacoustic bridgeware audio amplifier.

2, according to the described a kind of record of claim 1, put the novel circuit sound equipment and it is characterized in that preposing signal process circuit is by the record/playback of B card, the playback of A card, radio reception signal, CD signal, PHONO signal, electret microphone signal, " circuit input " signal is by 9 dpdt double-pole double-throw (DPDT) playback switch and K switch ₂, K ₃Finishing conversion records/puts and frequency compensation network, a shared preposition IC ₁TA7668 possesses main signal four tunnel output simultaneously and uses, characteristics of tool in addition, the playback of A card, CK ₃, CK ₄Socket can be talked about simultaneously and transfer the tube vocal accompaniment, in the time of recording, only need press B card record button, both can edit recording simultaneously.

3, according to the described a kind of record of claim 1, put the novel circuit sound equipment, it is characterized in that the magnetic bias loop be in the bias magnetic signal string through stereophonic signal C road is arranged and the circuit that links to each other in the time delayed signal of echoing stack is arranged, also be provided with the trapper interference guard between it.

4, according to the described a kind of record of claim 1, put the novel circuit sound equipment, 4. three tunnel balance tones, volume control circuit is characterized in that three road balanced potentiometers are coaxial three, input signal, W ₄, W ₆Two ends, left and right sides homophase and W ₅Balance three road signals are exported in the anti-phase connection in two ends, the left and right sides, center tap respectively, and tone circuit cooperates the equilibrium of audio amplifier audible frequency, and three volume potentiometers are coaxial three potentiometers.

5, according to the described a kind of record of claim 1, put the novel circuit sound equipment, it is characterized in that the identical power amplifier of power amplifier 1., identical power amplifier 2., 3. identical power amplifier make up, common ground is paired direct signal power amplifier, the power amplifier of being furnished with the time delayed signal that echoes has different expansion stereo arrangement circuit to select in addition between characteristics power amplifier of tool.