This circuit is a mono pre amp circuit, which can be used with a variety of inputs.Can be applied for extending the phone and the other with The circuit shown here uses a 741 with positive feedback via R5,R6 and R7 for fast switching.Voltage dividers R8 and r9 set the DC input voltage to the non-inverting input terminal to half the supply voltage.The amount of positive feedback depends on the ratio of R6 and r7.the larger the ratio,the smaller will be the hysterisis shown by the circuit.Potentiometer r2 sets the DC voltage to the inverting input terminal and thus sets the threshold voltage at which the signal will trigger the circuit.The input signal can be applied to either of the two input terminals Which can be connected to amplifier sound at allĪ Schmitt trigger circuit shows two distinct signal input levels for turning the circuit ON and OFF.The difference between the Von and Voff voltages called hysteris Schmitt triggers are useful in conbverting slowly rising waveforms into fast rising ones and in relay like application. from the signal that is adapted to go to the leg 2 (inverting amplifier signal to a phase) of IC1 and will expand the output of Pin 6 through a signal output from C8. The VR1 is adjusted – reduce the growth of low-frequency (BASS) and VR2 is increasing – rate of growth of the frequency High (TREBLE). Q1 is the e-limit circuit fault Peter Low Power Amplifier stand out in E via C2 to the region to adjust the bass – treble. To bias the pin B of Q1 and R3 are limited to flow properly. The audio input is entered through the C1 coupling to the input signal to the Q1 growth signal by R1 and R2 divide the voltage. The power supply circuit is used from 12-24 volt and Shine Power consumption is 10 mA. This helps the smooth bass voice circuit and a rate increase – reduction of the signal at 18 dB.
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