CN102801388A - Headphone amplification circuit capable of removing noise - Google Patents
Headphone amplification circuit capable of removing noise Download PDFInfo
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- CN102801388A CN102801388A CN2011101392603A CN201110139260A CN102801388A CN 102801388 A CN102801388 A CN 102801388A CN 2011101392603 A CN2011101392603 A CN 2011101392603A CN 201110139260 A CN201110139260 A CN 201110139260A CN 102801388 A CN102801388 A CN 102801388A
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Abstract
The invention provides a headphone amplification circuit capable of removing noise. The circuit comprises a left-track amplification circuit, a right-track amplification circuit, a circuit for providing quiescent operation points for operational amplifiers in the left-track amplification circuit and the right-track amplification circuit, a power filter circuit and a control circuit. According to the headphone amplification circuit capable of removing the noise, the control circuit can be added between the power supply of the headphone amplification circuit and each of an entire MUTE signal and a power failure signal, so that the headphone amplification circuit is in an off state during the startup, shutdown and power failure of the whole machine, and the noise generated in a headphone during the startup, shutdown and power failure of the whole machine is effectively removed.
Description
Technical field
The present invention relates to earphone control circuit technical field, relate in particular to a kind of earphone amplifying circuit of removing noise.
Background technology
On television set, common earphone amplifying circuit is generally formed amplifier by operational amplifier and discrete component, perhaps directly sends into earphone from left and right sides loudspeaker after through the power resistor step-down, and earpiece volume is regulated to be regulated by the television set speaker volume and accomplished.
As shown in Figure 1, the earphone amplifying circuit is included as operational amplifier provides the circuit 11 of quiescent point, electric source filter circuit 12, L channel amplifying circuit 13 and R channel amplifying circuit 14.
Wherein,, operational amplifier comprises for providing the circuit 11 of quiescent point: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2, and its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1.
Electric source filter circuit 12 comprises: the capacitor C 1 and the C2 that are connected in parallel to each other, and the end c ground connection after its parallel connection, other end d is connected to power supply VCC through inductance L 1, and the d end also is connected to the power end OP-VCC of operational amplifier, and inductance L 1 is the e end with power supply VCC link.
L channel amplifying circuit 13 comprises: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A; This inverting input is through capacitor C 6 ground connection; Simultaneously; This inverting input also is connected to its output through parallel resistor R4 and capacitor C 7; The in-phase input end of this operational amplifier connects the b end that operational amplifier most provides quiescent operation dot circuit 11, this operational amplifier earth terminal ground connection, and power end is connected to the power end OP-VCC of operational amplifier.The output of computing operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8; Wherein, The output of computing operational amplifier N1A also passes through resistance R 5 ground connection, the capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, and the other end is connected between capacitor C 8 and the earphone socket.
R channel amplifying circuit 14 comprises: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B; This inverting input is through capacitor C 11 ground connection; Simultaneously; This inverting input also is connected to its output through parallel resistor R9 and capacitor C 12; The in-phase input end of this operational amplifier connects the b end that operational amplifier most provides quiescent operation dot circuit 11, this operational amplifier earth terminal ground connection, and power end is connected to the power end OP-VCC of operational amplifier.The output of computing operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13; Wherein, The output of computing operational amplifier N1B is also through resistance R 10 ground connection; The capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, the other end is connected capacitor C 13 and earphone socket intermediate contact.
Can find out that from above-mentioned earphone amplification circuit diagram L channel amplifying circuit 13 and R channel amplifying circuit 14 power in running order always from start, do not receive any control., television boot-strap all in earphone, produce noise unavoidably when shutting down.
Summary of the invention
For this reason, technical problem to be solved by this invention is: a kind of earphone amplifying circuit of removing noise is provided, can removes the earphone noise.
So, the invention provides a kind of earphone amplifying circuit of removing noise, comprise L channel amplifying circuit, R channel amplifying circuit, the circuit and the electric source filter circuit of quiescent point are provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit; This electric source filter circuit is connected in this circuit between the power supply VCC and power supply OP-VCC, and power supply OP-VCC is the operational amplifier power supply in L channel amplifying circuit and the R channel amplifying circuit, wherein; Also comprise a control circuit; The collector electrode of triode V1 is connected to electric source filter circuit, and emitter is connected to power supply VCC, and base stage is connected to emitter through resistance R 13; Base stage also is connected to the collector electrode of triode V2 through resistance R 14 simultaneously; The grounded emitter of triode V2, the base stage of triode V2 is connected to the collector electrode of triode V3, parallel resistor R15 and capacitor C 15 one of which end ground connection; The other end is connected to the base stage of triode V2; The collector electrode of triode V3 is connected to power supply VCC through resistance R 17, the grounded emitter of triode V3, and the base stage of triode V3 is connected to complete machine MUTE signal through resistance R 16.
Above-mentioned earphone amplifying circuit also comprises: the collector electrode of triode V4 is connected to the base stage of triode V2, the grounded emitter of triode V4, and the base stage of triode V4 is connected to power-off signal through resistance R 18.
Wherein, The said circuit that quiescent point is provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit; Comprise: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2; Its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1, and this b end also is connected to the in-phase input end of amplifier in L channel amplifying circuit and the R channel amplifying circuit respectively simultaneously.
Wherein, said electric source filter circuit comprises: the capacitor C 1 and the C2 that are connected in parallel to each other, and the end c ground connection after its parallel connection, other end d is connected to the collector electrode of triode V1 through inductance L 1.
Wherein, Said L channel amplifying circuit comprises: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A, and this inverting input is through capacitor C 6 ground connection; Simultaneously; This inverting input also is connected to its output through parallel resistor R4 and capacitor C 7, and the in-phase input end of operational amplifier N1A connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point, operational amplifier N1A earth terminal ground connection; Power end is connected to the power end OP-VCC of operational amplifier; The output of operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8, and wherein, the output of computing operational amplifier N1A is also through resistance R 5 ground connection; The capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, the other end is connected the intermediate contact of capacitor C 8 and earphone socket.
Wherein, Said R channel amplifying circuit comprises: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B, and this inverting input is through capacitor C 11 ground connection; Simultaneously; This inverting input also is connected to its output through parallel resistor R9 and capacitor C 12, and the in-phase input end of operational amplifier N1B connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point, operational amplifier N1B earth terminal ground connection; Power end is connected to the power end OP-VCC of operational amplifier; The output of operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13, and wherein, the output of computing operational amplifier N1B is also through resistance R 10 ground connection; The capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, the other end is connected the intermediate contact of capacitor C 13 and earphone socket.
In the above-mentioned earphone amplifying circuit; The said circuit that quiescent point is provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit; Comprise: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2; Its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1, and this b end also is connected to the in-phase input end of amplifier in L channel amplifying circuit and the R channel amplifying circuit respectively simultaneously;
Said electric source filter circuit comprises: the capacitor C 1 and the C2 that are connected in parallel to each other, and the end c ground connection after its parallel connection, other end d is connected to the collector electrode of triode V1 through inductance L 1;
Said L channel amplifying circuit; Comprise: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A; This inverting input is through capacitor C 6 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R4 and capacitor C 7; The in-phase input end of operational amplifier N1A connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1A earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8; Wherein, The output of computing operational amplifier N1A also passes through resistance R 5 ground connection, the capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 8 and earphone socket;
Said R channel amplifying circuit; Comprise: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B; This inverting input is through capacitor C 11 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R9 and capacitor C 12; The in-phase input end of operational amplifier N1B connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1B earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13; Wherein, The output of computing operational amplifier N1B also passes through resistance R 10 ground connection, the capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 13 and earphone socket.
The present invention also provides a kind of earphone amplifying circuit of removing noise; Comprise L channel amplifying circuit, R channel amplifying circuit, be connected in this circuit between the power supply VCC and power supply OP-VCC that power supply OP-VCC is the operational amplifier power supply in L channel amplifying circuit and the R channel amplifying circuit for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit provides the circuit and the electric source filter circuit of quiescent point, this electric source filter circuit; Wherein, Also comprise: a control circuit, the collector electrode of triode V1 is connected to electric source filter circuit, and emitter is connected to power supply VCC; Base stage is connected to emitter through resistance R 13; Base stage also is connected to the collector electrode of triode V2 through resistance R 14 simultaneously, the grounded emitter of triode V2, and the base stage of triode V2 is connected to the collector electrode of triode V4; Parallel resistor R15 and capacitor C 15 one of which end ground connection; The other end is connected to the base stage of triode V2, the grounded emitter of triode V4, and the base stage of triode V4 is connected to power-off signal through resistance R 18.
Above-mentioned earphone amplifying circuit also comprises: the collector electrode of triode V3 is connected with the base stage of triode V2, and is connected to power supply VCC through resistance R 17, the grounded emitter of triode V3, and the base stage of triode V3 is connected to complete machine MUTE signal through resistance R 16.
Wherein, The said circuit that quiescent point is provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit; Comprise: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2; Its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1, and this b end also is connected to the in-phase input end of amplifier in L channel amplifying circuit and the R channel amplifying circuit respectively simultaneously;
Said electric source filter circuit comprises: the capacitor C 1 and the C2 that are connected in parallel to each other, and the end c ground connection after its parallel connection, other end d is connected to the collector electrode of triode V1 through inductance L 1;
Said L channel amplifying circuit; Comprise: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A; This inverting input is through capacitor C 6 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R4 and capacitor C 7; The in-phase input end of operational amplifier N1A connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1A earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8; Wherein, The output of computing operational amplifier N1A also passes through resistance R 5 ground connection, the capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 8 and earphone socket;
Said R channel amplifying circuit; Comprise: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B; This inverting input is through capacitor C 11 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R9 and capacitor C 12; The in-phase input end of operational amplifier N1B connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1B earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13; Wherein, The output of computing operational amplifier N1B also passes through resistance R 10 ground connection, the capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 13 and earphone socket.
The earphone amplifying circuit of removing noise according to the invention; Through between the power supply of earphone amplifying circuit and complete machine MUTE signal, power-off signal, increasing by a control circuit; Make complete machine when start and close and power down; The earphone amplifying circuit is in off-position, the noise that in earphone, has produced when effectively having removed because of complete machine start and close and power down.
Description of drawings
Fig. 1 is a prior art headphone amplification circuit diagram;
Fig. 2 is the said earphone amplification circuit diagram of removing noise of the embodiment of the invention.
Embodiment
Below, describe the present invention in conjunction with accompanying drawing.
As shown in Figure 2; Present embodiment provides a kind of earphone amplifying circuit of removing noise, and this circuit comprises: L channel amplifying circuit 23, R channel amplifying circuit 24, circuit 21, electric source filter circuit 22 and a control circuit of quiescent point are provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit.
Wherein, Operational amplifier in L channel amplifying circuit and the R channel amplifying circuit provides the circuit 21 of quiescent point; Comprise: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2; Its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1, and this b end also is connected to the in-phase input end of amplifier N1A and amplifier N1B in L channel amplifying circuit and the R channel amplifying circuit respectively simultaneously.
Electric source filter circuit 22 comprises: the capacitor C 1 and the C2 that are connected in parallel to each other, and the end c ground connection after its parallel connection, other end d is connected to the collector electrode of triode V1 through inductance L 1, and promptly the e of inductance L 1 end is connected to the collector electrode of triode V1.
L channel amplifying circuit 23; Comprise: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A; This inverting input is through capacitor C 6 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R4 and capacitor C 7; The in-phase input end of operational amplifier N1A connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1A earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8; Wherein, The output of computing operational amplifier N1A also passes through resistance R 5 ground connection, the capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 8 and earphone socket.
R channel amplifying circuit 24; Comprise: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B; This inverting input is through capacitor C 11 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R9 and capacitor C 12; The in-phase input end of operational amplifier N1B connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1B earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13; Wherein, The output of computing operational amplifier N1B also passes through resistance R 10 ground connection, the capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 13 and earphone socket.
Control circuit, can be first control circuit: the collector electrode of triode V1 be connected to electric source filter circuit, and emitter is connected to power supply VCC; Base stage is connected to emitter through resistance R 13, and base stage also is connected to the collector electrode of triode V2, the grounded emitter of triode V2 through resistance R 14 simultaneously; The base stage of triode V2 is connected to the collector electrode of triode V3; Parallel resistor R15 and capacitor C 15 one of which end ground connection, the other end is connected to the base stage of triode V2, and the collector electrode of triode V3 is connected to power supply VCC through resistance R 17; The grounded emitter of triode V3; The base stage of triode V3 is connected to complete machine MUTE signal through resistance R 16, and it is the quiet control signal of complete machine for the MUTE signal, when pressing the quiet key of remote controller be exactly this signal in action.
Further, above-mentioned first control circuit can comprise: the collector electrode of triode V4 is connected to the base stage of triode V2, the grounded emitter of triode V4, and the base stage of triode V4 is connected to power-off signal through resistance R 18.
Certainly, control circuit, can also be second control circuit: the collector electrode of triode V1 be connected to electric source filter circuit; Emitter is connected to power supply VCC, and base stage is connected to emitter through resistance R 13, and base stage also is connected to the collector electrode of triode V2 through resistance R 14 simultaneously; The grounded emitter of triode V2; The base stage of triode V2 is connected to the collector electrode of triode V4, parallel resistor R15 and capacitor C 15 one of which end ground connection, and the other end is connected to the base stage of triode V2; The grounded emitter of triode V4, the base stage of triode V4 is connected to power-off signal through resistance R 18.
Further; Above-mentioned second control circuit can also comprise: the collector electrode of triode V3 is connected with the base stage of triode V2; And be connected to power supply VCC through resistance R 17, the grounded emitter of triode V3, the base stage of triode V3 is connected to complete machine MUTE signal through resistance R 16.
When the firm start of TV has powered on, because MUTE is a high level, triode V3 saturation conduction, the collector electrode output low level of triode V3; Triode V2 is not owing to there being base bias voltage to end, and triode V2 does not have the loop by the BE knot that makes V1, and triode V1 is also ended, and the collector electrode of triode V1 does not have voltage output; Operational amplifier N1A and operational amplifier N1B do not have power supply not work, and when complete machine powering finishes, begin in the display image MUTE output low level; Triode V3 ends, and triode V2 obtains bias voltage and saturation conduction through R17, so the BE of triode V1 knot also obtains bias voltage and conducting; Pressure drop is very little between the CE electrode of triode V1, makes amplifier obtain operating voltage, starts working; Triode V4 is used for power down control, when complete machine powering, to not influence of circuit.
When television set shut down, power-off signal was exported high level immediately to triode V4 base stage, makes triode V4 conducting, so triode V2, triode V1 ends rapidly, cut off the power supply of operational amplifier N1A and computing generator N1B, prevented to produce noise.Through actual debugging, the circuit effect is obvious, and no matter when earphone inserts, and can both avoid noise to produce.
Technique scheme is improved on prior art circuits is integrated, makes the earphone amplifying circuit of not too being paid attention to by the people that obvious improvement arranged, and no longer includes noise and produces
In sum; The said earphone amplifying circuit of removing noise of the embodiment of the invention; Through between the power supply of earphone amplifying circuit and complete machine MUTE signal, power-off signal, increasing by a control circuit; Make complete machine when start and close and power down, the earphone amplifying circuit is in off-position, the noise that in earphone, has produced when effectively having removed because of complete machine start and close and power down.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the earphone amplifying circuit that can remove noise comprises L channel amplifying circuit, R channel amplifying circuit, is connected in this circuit between the power supply VCC and power supply OP-VCC for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit provides the circuit and the electric source filter circuit of quiescent point, this electric source filter circuit; Power supply OP-VCC is the operational amplifier power supply in L channel amplifying circuit and the R channel amplifying circuit; It is characterized in that, also comprise: a control circuit, the collector electrode of triode V1 is connected to electric source filter circuit; Emitter is connected to power supply VCC; Base stage is connected to emitter through resistance R 13, and base stage also is connected to the collector electrode of triode V2, the grounded emitter of triode V2 through resistance R 14 simultaneously; The base stage of triode V2 is connected to the collector electrode of triode V3; Parallel resistor R15 and capacitor C 15 one of which end ground connection, the other end is connected to the base stage of triode V2, and the collector electrode of triode V3 is connected to power supply VCC through resistance R 17; The grounded emitter of triode V3, the base stage of triode V3 is connected to complete machine MUTE signal through resistance R 16.
2. the earphone amplifying circuit of removing noise according to claim 1; It is characterized in that; Also comprise: the collector electrode of triode V4 is connected to the base stage of triode V2, the grounded emitter of triode V4, and the base stage of triode V4 is connected to power-off signal through resistance R 18.
3. according to claim 1 or the 2 described earphone amplifying circuits of removing noise; It is characterized in that; The said circuit that quiescent point is provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit; Comprise: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2; Its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1, and this b end also is connected to the in-phase input end of amplifier in L channel amplifying circuit and the R channel amplifying circuit respectively simultaneously.
4. according to claim 1 or the 2 described earphone amplifying circuits of removing noise; It is characterized in that said electric source filter circuit comprises: the capacitor C 1 and the C2 that are connected in parallel to each other; End c ground connection after its parallel connection, other end d is connected to the collector electrode of triode V1 through inductance L 1.
5. according to claim 1 or the 2 described earphone amplifying circuits of removing noise, it is characterized in that said L channel amplifying circuit; Comprise: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A; This inverting input is through capacitor C 6 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R4 and capacitor C 7; The in-phase input end of operational amplifier N1A connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1A earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8; Wherein, The output of computing operational amplifier N1A also passes through resistance R 5 ground connection, the capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 8 and earphone socket.
6. according to claim 1 or the 2 described earphone amplifying circuits of removing noise; It is characterized in that; Said R channel amplifying circuit comprises: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B, and this inverting input is through capacitor C 11 ground connection; Simultaneously; This inverting input also is connected to its output through parallel resistor R9 and capacitor C 12, and the in-phase input end of operational amplifier N1B connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point, operational amplifier N1B earth terminal ground connection; Power end is connected to the power end OP-VCC of operational amplifier; The output of operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13, and wherein, the output of computing operational amplifier N1B is also through resistance R 10 ground connection; The capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, the other end is connected the intermediate contact of capacitor C 13 and earphone socket.
7. according to claim 1 or the 2 described earphone amplifying circuits of removing noise; It is characterized in that; The said circuit that quiescent point is provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit; Comprise: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2; Its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1, and this b end also is connected to the in-phase input end of amplifier in L channel amplifying circuit and the R channel amplifying circuit respectively simultaneously;
Said electric source filter circuit comprises: the capacitor C 1 and the C2 that are connected in parallel to each other, and the end c ground connection after its parallel connection, other end d is connected to the collector electrode of triode V1 through inductance L 1;
Said L channel amplifying circuit; Comprise: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A; This inverting input is through capacitor C 6 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R4 and capacitor C 7; The in-phase input end of operational amplifier N1A connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1A earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8; Wherein, The output of computing operational amplifier N1A also passes through resistance R 5 ground connection, the capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 8 and earphone socket;
Said R channel amplifying circuit; Comprise: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B; This inverting input is through capacitor C 11 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R9 and capacitor C 12; The in-phase input end of operational amplifier N1B connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1B earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13; Wherein, The output of computing operational amplifier N1B also passes through resistance R 10 ground connection, the capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 13 and earphone socket.
8. the earphone amplifying circuit that can remove noise comprises L channel amplifying circuit, R channel amplifying circuit, is connected in this circuit between the power supply VCC and power supply OP-VCC for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit provides the circuit and the electric source filter circuit of quiescent point, this electric source filter circuit; Power supply OP-VCC is the operational amplifier power supply in L channel amplifying circuit and the R channel amplifying circuit, it is characterized in that, also comprises: a control circuit; The collector electrode of triode V1 is connected to electric source filter circuit; Emitter is connected to power supply VCC, and base stage is connected to emitter through resistance R 13, and base stage also is connected to the collector electrode of triode V2 through resistance R 14 simultaneously; The grounded emitter of triode V2; The base stage of triode V2 is connected to the collector electrode of triode V4, parallel resistor R15 and capacitor C 15 one of which end ground connection, and the other end is connected to the base stage of triode V2; The grounded emitter of triode V4, the base stage of triode V4 is connected to power-off signal through resistance R 18.
9. the earphone amplifying circuit of removing noise according to claim 8; It is characterized in that; Also comprise: the collector electrode of triode V3 is connected with the base stage of triode V2; And be connected to power supply VCC through resistance R 17, the grounded emitter of triode V3, the base stage of triode V3 is connected to complete machine MUTE signal through resistance R 16.
10. according to Claim 8 or the 9 described earphone amplifying circuits of removing noise; It is characterized in that; The said circuit that quiescent point is provided for the operational amplifier in L channel amplifying circuit and the R channel amplifying circuit; Comprise: the capacitor C 4 that is connected in parallel to each other, capacitor C 3 and resistance R 2; Its parallel connection back one end a ground connection, other end b is connected to the power end OP-VCC of operational amplifier through resistance R 1, and this b end also is connected to the in-phase input end of amplifier in L channel amplifying circuit and the R channel amplifying circuit respectively simultaneously;
Said electric source filter circuit comprises: the capacitor C 1 and the C2 that are connected in parallel to each other, and the end c ground connection after its parallel connection, other end d is connected to the collector electrode of triode V1 through inductance L 1;
Said L channel amplifying circuit; Comprise: the capacitor C 5 of left channel signals input L-IN through series connection and resistance R 3 are connected to the inverting input of operational amplifier N1A; This inverting input is through capacitor C 6 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R4 and capacitor C 7; The in-phase input end of operational amplifier N1A connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1A earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1A is connected to earphone socket XS1 through the resistance R 6 of series connection with capacitor C 8; Wherein, The output of computing operational amplifier N1A also passes through resistance R 5 ground connection, the capacitor C 9 and the resistance R 7 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 8 and earphone socket;
Said R channel amplifying circuit; Comprise: the capacitor C 10 of right-channel signals input R-IN through series connection and resistance R 8 are connected to the inverting input of operational amplifier N1B; This inverting input is through capacitor C 11 ground connection, and simultaneously, this inverting input also is connected to its output through parallel resistor R9 and capacitor C 12; The in-phase input end of operational amplifier N1B connects the b end that operational amplifier in most the L channel amplifying circuit and R channel amplifying circuit provides the circuit of quiescent point; Operational amplifier N1B earth terminal ground connection, power end is connected to the power end OP-VCC of operational amplifier, and the output of computing operational amplifier N1B is connected to earphone socket XS1 through the resistance R 11 of series connection with capacitor C 13; Wherein, The output of computing operational amplifier N1B also passes through resistance R 10 ground connection, the capacitor C 14 and the resistance R 12 one of which end ground connection of parallel connection, and the other end is connected the intermediate contact of capacitor C 13 and earphone socket.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110139260.3A CN102801388B (en) | 2011-05-27 | 2011-05-27 | The earphone amplifying circuit of noise can be removed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110139260.3A CN102801388B (en) | 2011-05-27 | 2011-05-27 | The earphone amplifying circuit of noise can be removed |
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| CN102801388A true CN102801388A (en) | 2012-11-28 |
| CN102801388B CN102801388B (en) | 2016-03-16 |
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| CN201110139260.3A Active CN102801388B (en) | 2011-05-27 | 2011-05-27 | The earphone amplifying circuit of noise can be removed |
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| CN104581534A (en) * | 2015-01-22 | 2015-04-29 | 四川省阳子森环保设备有限公司 | Efficient noise control device |
| CN108564939A (en) * | 2018-06-28 | 2018-09-21 | 陈经纶 | A kind of active sound field extension noise reduction system |
| 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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| Publication number | Publication date |
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| CN102801388B (en) | 2016-03-16 |
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