CN2324710Y - Stereo wireless transmitting receiver - Google Patents

Abstract

The utility model relates to a stereo wireless transmitting and receiving apparatus which utilizes 433 to 435 MHz super high frequency to transmit audio signals. The apparatus is composed of a stereophonic wireless emitter and a stereophonic wireless receiver. The stereophonic audio signals fetched by the audio output terminals of household appliances such as television sets, acoustic equipment, etc. are accessed to the input plug of the emitter, and are modulated into super high frequency frequency-modulated carrier wave signals for emitting outwards. After the stereophonic carrier wave signals are received by the receiver, the stereophonic carrier wave signals are demodulated and reduced into stereophonic audio signals which are amplified for driving an earphone and a horn to sound. Listeners can not be restricted by places, space and interval, and the utility model has no influence on other people's studying, working and rest; the utility model has high fidelity, and is particularly suitable for appreciating music programs with stereo sound sources.

Description

The stereo radio sending and receiving apparatus

The utility model relates to a kind of stereo radio sending and receiving apparatus that utilizes 433～435MHZ hyperfrequency transmitting audio signal.

In family, classroom, conference hall or other public places, people taste music program in order to reach lightheartedly glad, listen to information etc., and don't influence other people working and learning, often utilize the wireless transmission receiving system information of carrying out to propagate, this monaural wireless transmission system often makes the signal distortion height of transmission owing to the imperfection of function, influenced the effect that the user listens to greatly.

The purpose of this utility model is a kind of stereo radio sending and receiving apparatus of development, has the fidelity height, the characteristics that audibility is good.

The utility model stereo radio sending and receiving apparatus is made up of stereo radio reflector and stereo radio receiver.The stereo radio reflector is become by following column circuit banks: by audio signal input circuit (1), ALC pre-amplification circuit (2), preemphasis circuit (3) is connected to stereosonic one of them sound channel input branch road successively, by audio signal input circuit (11), ALC pre-amplification circuit (12), preemphasis circuit (13) is connected to stereo another sound channel input branch road successively, two sound channel input branch roads are connected to combiner circuit (4) side by side, again successively through tuning circuit (5), VCO VCO FM circuit (6), hyperfrequency power amplifier (7), antenna-matching circuit (8) connects transmitting antenna (9) at last; The circuit bank of stereo radio receiver becomes: reception antenna (22), antenna input circuit (23), hyperfrequency frontend amplifying circuit (24), first local-oscillator circuit (25), the first down-conversion mixting circuit (26), first intermediate frequency amplifier circuit (27), second local-oscillator circuit (28), the second down-conversion mixting circuit (29), second intermediate frequency amplifier circuit (30), frequency-discriminating circuit (31), stereo decoding circuit (34), above circuit connects successively, be divided into two sound channels later on, one sound channel is followed successively by RC filter circuit (35), audio power amplifying circuit (37), electroacoustic is primary circuit (39) also, another sound channel is followed successively by RC filter circuit (36), audio power amplifying circuit (38), electroacoustic be primary circuit (40) also.

Hyperfrequency is stereo to be transmitted and received owing to adopt, not only easy to use, and the fidelity height, and sensation on the spot in person seemingly especially is fit to the glad music program of tasting stereo sound source.

Fig. 1 is the electric functional-block diagram of stereo radio reflector.

Fig. 2 is the electric functional-block diagram of stereo radio receiver.

Fig. 3 is the circuit theory diagrams of stereo radio reflector.

Fig. 4 is a stereo radio reflector high frequency tuner circuit schematic diagram.

Fig. 5 is the circuit theory diagrams of stereo radio receiver.

Fig. 6 is a stereo radio receiver high frequency tuner circuit schematic diagram.

Among Fig. 1, the stereophonic signal input of stereo radio reflector divides two branch roads, route audio signal input circuit 1, ALC pre-amplification circuit 2, preemphasis circuit 3 is connected in sequence, another route audio signal input circuit 11, ALC pre-amplification circuit 12, preemphasis circuit 13 are connected in sequence, two sound channel input branch roads are connected to combiner circuit 4 side by side, connect tuning circuit 5, VCO VCO FM circuit 6, hyperfrequency power amplifier 7, antenna-matching circuit 8 more successively, by transmitting antenna 9 required stereophonic signal launched at last.

Among Fig. 2, the stereophonic signal of stereo radio receiver enters antenna input circuit 23 after reception antenna 22 receives, successively through hyperfrequency frontend amplifying circuit 24, first local-oscillator circuit 25, the first down-conversion mixting circuit 26, first intermediate frequency amplifier circuit 27, second local-oscillator circuit 28, the second down-conversion mixting circuit 29, second intermediate frequency amplifier circuit 30, frequency-discriminating circuit 31, stereo decoding circuit 34, be divided into identical two sound channels of circuit later on, a sound channel is followed successively by also primary circuit 39 of RC filter circuit 35, audio power amplifying circuit 37, electroacoustic; Another sound channel is followed successively by also primary circuit 40 of RC filter circuit 36, audio power amplifying circuit 38, electroacoustic.

Among Fig. 3, Fig. 4, stereo left channel input A also connects capacitor C 60 and lands, and then through resistance R 1, capacitor C 1 high peaking circuit, again through resistance R 3, capacitor C 4 and connect and land, advances the 2nd pin of the preposition amplification circuit IC1 of ALC then; R channel input B also connects capacitor C 61 and lands, after resistance R 2, capacitor C 2 high peaking circuits, again and connecting resistance R4, capacitor C 5 land, enter the 8th pin of IC1; IC1 the 4th pin ground connection, the 6th pin meets power supply VC (can choose 12V), the 5th pin meets biasing resistor R5, and meet shunt capacitance C3 and land, the 3rd pin of IC1, the 7th pin are respectively left and right acoustic channels output, wherein branch road of the 3rd pin connects IC1 the 1st pin by resistance R 11, the 1st pin then is connected in series R7, R8, C7 lands, another branch road of the 3rd pin is series resistor R13 and meet R15 and land then, connect R17, C9, C10 preemphasis circuit after the dividing potential drop, be coupled to the 18th pin of the synthetic integrated circuit (IC) 2 of pilot tone system stereophonic signal again by C13, the 18th pin also meets C17 and lands; Same IC1 the 7th pin R channel output connects two branch roads, wherein a branch road connects IC1 the 9th pin by R12, the 9th pin then is connected in series R9, R10, C8 lands, another branch road then is connected in series R14 and meets R16 and lands, connect R18, C11, C12 preemphasis circuit after the dividing potential drop, be coupled to IC2 the 1st pin through C14 again, IC2 the 1st pin also meets C18 and lands; IC2 the 2nd pin lands by C19, R20 parallel connection, the 3rd pin lands, the 4th pin lands through C20, the 5th pin connects the 6th pin through string 38KHZ quartz resonator Y1, R21, C21, the 7th pin, the 8th pin land, and the 9th, 10,11,12 pin are unsettled, and the 13rd pin connects the 14th pin through string R22, C23, R23, C24, and the node between C23 and R23 and R24, C25 land, simultaneously at this node strings R25, C26 to reflector tuner H input VM; The 16th pin of IC2 meets power supply+VC through L1, and the 15th pin also connects trimmer potentiometer VR1 cursor slide end, and all the other two ends of VR1 connect the 16th, 17 pin of IC2 respectively; In reflector tuner H, the base stage one tunnel of transistor Q101 is landed through capacitor C 101, C102, resistance R 102 parallel connections, and another road meets VC through resistance R 101, and Third Road connects the emitter of transistor Q101 through capacitor C 103; The emitter of Q101 lands through R104, also presses the Q101 collector electrode through C104, and again through C112 coupling, indirect T type network L102, L103, C113 filtering connect the base stage of transistor Q102 through the C114 coupling; The Q101 collector electrode meets power supply VC through R103, and also C109 in parallel receives on dielectric resonator DR input and C107, the C108 after C105, C106 series connection; The C108 other end is for landing, and the C107 other end then meets diode D101 negative pole and R105, and the D101 positive pole lands, R105 other end reflector tuner input VM; The Q102 base stage and meet C115, R107 lands, simultaneously meet power supply VC through R106 again, emitter and meet R109, C116 lands, collector electrode one tunnel meets power supply VC through L104, the T type network filtering that another route L105, L106, C117 constitute and C118, L107 constitute antenna-matching circuit and receive on the antenna.

In the circuit of stereo hyperfrequency wireless launcher, stereo audio signal divides on a left side, R channel enters the audio frequency input plug of reflector, left channel audio signal is through inductance F3, capacitor C 60 filtering Radio Frequency Interfere compositions, and then through C1, R1 RC loop in parallel and R3 dividing potential drop, play certain high frequency compensation effect, enter IC1 the 2nd pin then, do the preposition amplification of ALC by IC1, it is for the filtering Radio Frequency Interfere that C4 receives between IC1 the 2nd pin and ground, IC1 adopts the KA22241 integrated circuit, this is a binary channels, the pre-amplification circuit of band automatic electric-level control, by the 3rd pin of IC1 draw output signal through the R11 negative feedback to IC1 the 1st pin, add R8 by R11 and R7 and determine inner gain amplifier, reach the purpose of control ALC initial control level.C3, R5 then determine the time constant that ALC starts to control.Signal is after IC1 amplifies, again by R13, R15 series connection dividing potential drop, decay to suitable level, do to send into IC2 (BA1404) with right-channel signals and the synthetic pilot tone system stereo composite signal of 19KHZ pilot signal by the C13 coupling after the preemphasis by C9, C10, R15 then.Right channel audio signal input in like manner comes after C61 filtering, C2, R2, the R4 high frequency compensation enters IC1 the 8th pin and does the preposition amplification of ALC, again through R4, decay of R18 dividing potential drop and C11, C12, after the R18 preemphasis, be coupled into IC2 the 1st pin by C14, the balance of left and right acoustic channels can be controlled by VR1, the gain of IC2 internal amplifier is determined by R20, quartz vibrator Y1 and R21, C21 receives IC2 the 5th pin the 6th pin and constitutes the 38KHZ subcarrier oscillator, obtain the 19KHZ pilot tone in IC2 inside through frequency division, a left side subtracts the right side (L-R) signal modulates 38KHZ, and the 19KHZ pilot tone is exported from the 13rd pin, and left and right sides composite signal is exported from the 14th pin, through C24, R23 and R22, the three-dimensional composite signal of C23 synthetic standards, the DC level superposition on C26 coupling and VR2 cursor slide send the modulation of the VCO modulation input VM working frequency in the tuner, the variable direct voltage of VR2 can be done the tuning of 433～435MHZ to the centre frequency of VCO.At inner Q101 (can select 2SC3355 for use) of tuner and C104, C103, C105, C106, C107, C108, C109, DR, D101, R101, R102, R103, R105 constitutes the Voltage-Controlled oscillation circuit of standard, the VCO frequency of oscillation is controlled by the VM terminal voltage, by the composite stereo acoustical signal of IC2 output and by the direct voltage of VR gained, at the VM end oscillator is done direct frequency modulation, carrier signal after the modulation is through C112, the C114 coupling, L102, L103, C113 filtering, deliver to Q102 (can select 2SC3355 for use) base stage, and Q102 and R106, R107, R108, L104, C114, C115, C116 constitutes high frequency power amplifier, modulated carrier wave is amplified, then through L105, L106, C117, C118, filtering and impedance matching circuit that L107 constitutes are sent to aerial radiation to the space with signal.

Among Fig. 5, Fig. 6, antenna, is connected to C202 and lands after inductance L 201 is landed and connect the g1 utmost point of field effect transistor Q201 through capacitor C 201 string L202 through receiver tuner input W201 between C201 and L202, and the g1 utmost point also and have R201 to land; The g2 utmost point of Q201 and meet R202, C203 lands, and connects interface between L206 and the L207 through R203 again; The S utmost point of Q201 lands, the d utmost point then connects tie point between L206 and the L207 through L203, this tie point is parallel with C213, C214 lands, the d utmost point also and have C204 to land, the d utmost point one tunnel connects transistor Q202 emitter through C205, the Q202 emitter also has L204, C206 to land, and connect transistor Q203 emitter through C207; The Q202 base stage is landed through C208, and connects tie point between L206 and the L207 through R204; Q202 collector electrode and C209 land, again through L205 string C210 to medium frequency output end W202, at W202 and meet C211 and land, at the tie point between L205 and the C210 again on R205 connects tie point between L206 and the L207; The Q203 emitter also has C221, R206 to land, and connects the Q203 collector electrode through C215 again, connects the Q203 base stage through C216, and base stage also meets R208 and C219 lands; And connect the Q203 collector electrode through R207; The Q203 collector electrode also lands through C216 string C2117, resonator DR1, and also there is C220 at the DR1 two ends; The Q203 collector electrode is gone here and there L206 to power supply+V (can select 2.4V for use) through L207; Medium frequency output end W202 connects the 1st pin of putting integrated circuit (IC) 301 in the frequency conversion, the 2nd pin of IC301 lands, the 3rd pin connects the 8th pin through ceramic filter X302, the public pin of X302 meets power supply+V, the 5th pin lands through C313, the 6th pin then meets power supply+V, the 7th pin is unsettled, the 9th pin lands, and the 10th pin meets power supply+V through R318 string D304, meets R321 and land on R318 and D304 series connection node, the 11st pin connects the negative pole of LEDD303 through R319, the positive pole of D303 meets power supply+V, and to power supply+V, the 13rd pin and C321 land the 12nd pin through concatenated filter X301 and R806, land through R811 on another road, again by R311, the point of contact of R313 and R313 connects the C326 positive pole again, and the C326 negative pole connects one of two stiff ends of potentiometer VR302-1, and another stiff end then lands; IC301 the 14th pin and C320 land, and land through R310, R312 on another road, are connect one of stiff end of potentiometer VR302-2 again by C327, and another stiff end lands; IC301 the 15th pin meets power supply+V through resonator X303, the 16th pin meets power supply+V through C312, the 17th pin through R305 serial connection C310 again and C309 meet power supply+V, the 18th pin is through C308 to the 19 pin, the 19th pin is through C307, R308 also meets positive supply+V, the 19th pin connects one of potentiometer VR301 two stiff ends again, another stiff end of VR301 then lands through R304, and the VR301 cursor slide connects the C319 positive pole through R303, and the C319 negative pole lands, the C319 positive pole is respectively through R301, diode D301 negative pole, the D301 positive pole lands, and D301 the two poles of the earth also meet C301, and the D302 positive pole lands, anodal another road of C319 connects the D802 negative pole through R302, C304, L302 is put and connect to the C305 serial connection, R307 is to power supply+V, and IC301 the 20th pin is unsettled, and the 22nd pin meets power supply+V, the 23rd pin is through L301, C306 also is connected to the 22nd pin, and another road connects the D301 negative pole through C303; The VR302-1 cursor slide connects IC302 the 7th pin, and and meet C325 and land, the VR302-2 cursor slide connects IC302 the 6th pin, and and meet C324 and land, IC302 the 8th pin serial connection R316, C333 land, the 5th pin serial connection R317, C333 land, the 4th pin lands, and the 3rd pin connects the L channel loudspeaker through C331, and lands at this end string C329, R315, the loudspeaker other end lands, IC302 the 2nd pin meets power supply+V, and the 1st pin connects the R channel loudspeaker through C330, and at this end string C328, R314 lands, and the loudspeaker other end lands.

In the circuit of stereo hyperfrequency wireless receiver, 433～435MHZ ultra-high frequency signal that antenna ANT obtains induction is sent into the W201 end of tuner, after L201, C201, L202, C202 constituted the frequency-selecting of impedance matching frequency-selective circuit, the 1st grid g1 that delivers to Q201 field effect transistor BF998 made the hyperfrequency front end and amplifies.Signal after the amplification is delivered to Q202 (2SC3355) emitter by C204, C205, C206, L204 frequency-selecting and impedance matching network, and transistor Q203 (2SC3355) and C216, C217, C218, C220, C219, DR221, R207, R208, R206 constitutes the oscillator of fixed-frequency at 500MHZ, and oscillator signal is delivered to the emitter of transistor Q202 by C207, the signal after amplifying with Q201 carries out mixing and amplification at Q202, passes through C209 then, C210, C211, L205 is different and different with tranmitting frequency with first intermediate frequency, 65～67MHZ, delivers to the W202 end.At mainboard, directly send into the frequency-selecting amplification that IC301 (selecting TA8122AF) the 1st pin is made first intermediate frequency by 65～67MHZ, first intermediate frequency that tuner W202 end obtains, the frequency-selecting resonant tank is by L301, C305, C303, C301, D301 constitutes, wherein because D301 is a variable capacitance diode, it passes through R301, R303, VR301, R304, R308 obtains a direct current tuning voltage, again by C308, the C307 tie point obtains one with the strong and weak alternating voltage that changes of carrier wave simultaneously, and superposition plays the effect that AFC follows the tracks of on direct voltage.First intermediate frequency through amplifying is sent to mixing unit in the IC301 through the IC301 internal wiring, and second local oscillator of this machine also is to be made of IC301 inside, its frequency of oscillation is by the C305 that receives 21 pin, C304, C302, D302, the L302 decision, and D302 also is a variable capacitance diode, and it is through R302, R303, VR301, R304, R308 obtain a direct voltage and through C307, the C308 tie point obtains with the strong and weak alternating voltage that changes of carrier wave, can obtain different direct voltages by adjusting VR301, change D301, the capacity of D302, thereby change the frequency-selecting tuning point of first intermediate frequency amplification and the frequency of oscillation of second local oscillator, make IC301 at first intermediate frequency when 65MHZ changes to 67MHZ, put in first and gain constantly all the time, and second intermediate frequency that mixing is come out is that 10.7MHZ is constant all the time.The about 75.7MHZ to 77.7MHZ of the frequency of second local oscillator is adjustable and the AFC locking is arranged, the second intermediate frequency 10.7MHZ signal of drawing by IC301, sending to the 8th pin through ceramic filter X302 frequency-selecting enters the inner intermediate frequency amplifier of IC301 and carries out putting in second, send into the frequency discriminator frequency discrimination of IC301 inside then, the required ceramic discriminator X301 of frequency discrimination is connected on the 12nd pin outward, the stereodecoder that the composite stereo acoustical signal that obtains behind the frequency discrimination send the 18th pin to enter IC301 inside in the output of IC301 the 19th pin through C308 carries out stereo decoding, simultaneously with VR301 on the direct voltage superposition, by D301, D302 does AFC control.The required 38KHZ switching signal of stereo decoding then is to produce the 456KHZ square wave by X303 ceramic resonator (external IC301 the 15th pin) and IC301 internal circuit, and then frequency division obtains.The stereo left and right sound channels signal of decoding gained is drawn IC301 by the 14th pin, the 13rd pin respectively, and then through C320, C321 postemphasises and R311, R313, R310, R312 carries out dividing potential drop, C326, C327 is coupled to potentiometer VR302-1, VR302-2 makes volume and regulates, and again through C324, C325 further postemphasises, enter the 6th, 7 pin of IC302 (selecting TDA2822S) then respectively, make audio power respectively and amplify.Audio power signal after the amplification, L channel is drawn through C331 by IC302 the 3rd pin and is promoted left side loudspeaker or earphone respectively, and R channel is exported through C330 by IC302 the 1st pin, the loudspeaker that connect the right promote sounding.

Claims (3)

1, a kind of stereo radio sending and receiving apparatus, form by stereo radio reflector and stereo radio receiver, it is characterized in that the stereo radio reflector is become by following column circuit banks: by audio signal input circuit (1), ALC pre-amplification circuit (2), preemphasis circuit (3) is connected to stereosonic one of them sound channel input branch road successively, by audio signal input circuit (11), ALC pre-amplification circuit (12), preemphasis circuit (13) is connected to stereo another sound channel input branch road successively, two sound channel input branch roads are connected to combiner circuit (4) side by side, again successively through tuning circuit (5), VCO VCO FM circuit (6), hyperfrequency power amplifier (7), antenna-matching circuit (8) connects transmitting antenna (9) at last; The circuit bank of stereo radio receiver becomes: reception antenna (22), antenna input circuit (23), hyperfrequency frontend amplifying circuit (24), first local-oscillator circuit (25), the first down-conversion mixting circuit (26), first intermediate frequency amplifier circuit (27), second local-oscillator circuit (28), the second down-conversion mixting circuit (29), second intermediate frequency amplifier circuit (30), frequency-discriminating circuit (31), stereo decoding circuit (34), above circuit connects successively, be divided into two sound channels later on, one sound channel is followed successively by RC filter circuit (35), audio power amplifying circuit (37), electroacoustic is primary circuit (39) also, another sound channel is followed successively by RC filter circuit (36), audio power amplifying circuit (38), electroacoustic be primary circuit (40) also.

2, a kind of stereo radio sending and receiving apparatus as claimed in claim 1, the circuit that it is characterized in that the stereo radio reflector is connected to: stereo left channel input A also connects capacitor C 60 and lands, then through resistance R 1, capacitor C 1 high peaking circuit, through resistance R 3, capacitor C 4 and connect and land, advance the 2nd pin of the preposition amplification circuit IC1 of ALC then again; R channel input B also connects capacitor C 61 and lands, after resistance R 2, capacitor C 3 high peaking circuits, again and connecting resistance R4, capacitor C 5 land, enter the 8th pin of IC1; IC1 the 4th pin ground connection, the 6th pin meets power supply VC, the 5th pin meets biasing resistor R5, and meet shunt capacitance C3 and land, the 3rd pin of IC1, the 7th pin are respectively left and right acoustic channels output, wherein branch road of the 3rd pin connects IC1 the 1st pin by resistance R 11, the 1st pin then is connected in series R7, R8, C7 lands, another branch road of the 3rd pin is series resistor R13 and meet R15 and land then, connect R17, C9, C10 preemphasis circuit after the dividing potential drop, be coupled to the 18th pin of the synthetic integrated circuit (IC) 2 of pilot tone system stereophonic signal again by C13, the 18th pin also meets C17 and lands; Same IC1 the 7th pin R channel output connects two branch roads, wherein a branch road connects IC1 the 9th pin by R12, the 9th pin then is connected in series R9, R10, C8 lands, another branch road then is connected in series R14 and meets R16 and lands, connect R18, C11, C12 preemphasis circuit after the dividing potential drop, be coupled to IC2 the 1st pin through C14 again, IC2 the 1st pin also meets C18 and lands; IC2 the 2nd pin lands by C19, R20 parallel connection, the 3rd pin lands, the 4th pin lands through C20, the 5th pin connects the 6th pin through string 38KHZ quartz resonator Y1, R21, C21, the 7th pin, the 8th pin land, and the 9th, 10,11,12 pin are unsettled, and the 13rd pin connects the 14th pin through string R22, C23, R23, C24, and the node between C23 and R23 and R24, C25 land, simultaneously at this node strings R25, C26 to reflector tuner H input VM; The 15th pin of IC2 meets power supply VC through L1, and the 15th pin also connects trimmer potentiometer VR1 cursor slide end, and all the other two ends of VR1 connect the 16th, 17 pin of IC2 respectively; In reflector tuner H, the base stage one tunnel of transistor Q101 is landed through capacitor C 101, C102, resistance R 102 parallel connections, and another road connects+VC through resistance R 101, and Third Road connects the emitter of transistor Q101 through capacitor C 103; The emitter of Q101 lands through R104, also connects the Q101 collector electrode through C104, and again through C112 coupling, indirect T type network L102, L103, C113 filtering connect the base stage of transistor Q102 through the C114 coupling; The Q101 collector electrode meets power supply+VC through R103, and also C109 in parallel receives dielectric resonator DR input and sends out on C107, the C108 after C105, C106 series connection; The C108 other end lands, and the C107 other end then meets diode D101 negative pole and R105, and the D101 positive pole lands, and the R105 other end is reflector tuner input VM; The Q102 base stage and meet C115, R107 lands, simultaneously meet power supply VC through R106 again, emitter and meet R109, C116 lands, collector electrode one tunnel meets power supply VC through L104, the T type network filtering of another route L105, L106, C117 and C118, L107 constitute antenna-matching circuit and receive on the antenna.

3, a kind of stereo radio sending and receiving apparatus as claimed in claim 1, the circuit that it is characterized in that the stereo radio receiver is connected to: antenna connects behind receiver tuner input W201 that inductance L 201 is landed and connects the g1 utmost point of field effect transistor Q201 through capacitor C 201 string L202, be connected to C202 and land between C201 and L202, the g1 utmost point also and have R201 to land; The g2 utmost point of Q201 and meet R202, C203 lands, and connects interface between L206 and the L207 through R203 again; The S utmost point of Q201 lands, the d utmost point then connects tie point between L206 and the L207 through L203, this tie point is parallel with C213, C214 lands, the d utmost point also and have C204 to land, d plate one tunnel connects transistor Q202 emitter through C205, the Q202 emitter also has L204, C206 to land, and connect transistor Q203 emitter through C207; The Q202 base stage is landed through C208, and connects tie point between L206 and the L207 through R204; Q202 collector electrode and C209 land, again through L205 string C210 to medium frequency output end W202, at W202 and meet C211 and land, at the tie point between L205 and the C210 again on R205 connects tie point between L206 and the L207; The Q203 emitter also has C221, R206 to land, and connects the Q203 collector electrode through C215 again, connects the Q203 base stage through C216, and base stage also meets R208 and C219 lands; And connect the Q203 collector electrode through R207; The Q203 collector electrode also lands through C216 string C218, harmonic oscillator DR1, and also there is C220 at the DR1 two ends; The Q203 collector electrode is gone here and there L206 to power supply+V through L207; Medium frequency output end W202 connects the 1st pin of putting integrated circuit (IC) 301 in the frequency conversion, the 2nd pin of IC301 lands, the 3rd pin connects the 1st pin of the 8 road IC301 through ceramic filter X302, the 2nd pin of IC301 lands, the 3rd pin connects the 8th pin through ceramic filter X302, the public pin of X302 meets power supply+V, and the 5th pin lands through C313, and the 6th pin then meets power supply+V, the 7th pin is unsettled, the 9th pin lands, and the 10th pin meets power supply+V through R318 string D304, meets R321 and land on R318 and D304 series connection node, the 11st pin connects the negative pole of LEDD303 through R319, the positive pole of D303 meets power supply+V, and to power supply+V, the 13rd pin and C321 land the 12nd pin through concatenated filter X301 and R306, land through R311 on another road, again by R311, the point of contact of R313 and R313 connects the C326 positive pole again, and the C326 negative pole connects one of two stiff ends of potentiometer VR302-1, and another stiff end then lands; IC301 the 14th pin and C320 land, and land through R310, R312 on another road, are connect one of stiff end of potentiometer VR302-2 again by C327, and another stiff end lands; IC301 the 15th pin meets power supply+V through resonator X303, the 16th pin meets power supply+V through C312, the 17th pin through R305 serial connection C310 again and C309 meet power supply+V, the 18th pin is through C308 to the 19 pin, the 19th pin is through C307, R308 also meets power supply+V, the 19th pin connects one of potentiometer VR301 two stiff ends again, another stiff end of VR301 then lands through R304, and the VR301 cursor slide connects the C319 positive pole through R303, and the C319 negative pole lands, the C319 positive pole is respectively through R301, diode D301 negative pole, the D301 positive pole lands, and D301 the two poles of the earth also meet C301, and the D302 positive pole lands, anodal another road of C319 connects the D302 negative pole through R302, C304, L302 is put and connect to the C305 serial connection, R307 is to power supply+V, and IC301 the 20th pin is unsettled, and the 22nd pin meets power supply+V, the 23rd pin is through L301, C306 also is connected to the 22nd pin, and another road connects the D301 negative pole through C303; The VR302-2 cursor slide connects IC302 the 7th pin, and and meet C325 and land, the VR302-2 cursor slide connects IC302 the 6th pin, and and meet C324 and land, IC302 the 8th pin serial connection R316, C332 land, the 5th pin serial connection R317, C333 land, the 4th pin lands, and the 3rd pin connects the L channel loudspeaker through C331, and lands at this end string C329, R315, the loudspeaker other end lands, IC302 the 2nd pin meets power supply+V, and the 1st pin connects the R channel loudspeaker through C330, and at this end string C328, R314 lands, and the loudspeaker other end lands.

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