741 Stereo PreAmplifier Circuit Diagram
This preamp circuit provides better than 20dB gain in each channel.
|R1 – R6
This circuit design for single power supply. so it use resistor network to divide the voltage. this circuit they are R9 and R10. resistors R9 and R10 place a voltage of half of the supply voltage across the non-inverting input which causes the output voltage to also be half of the supply voltage forming a sort of bias voltage. R9 and R10 can be any value from 1K to 100K. but they need to equal.
A better op-amp type will give a better noise figure and bandpass.
In this circuit the roll-off is acute at 20000 Hertz.
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