GF2A op amp audio amplifier circuit diagram

  
As shown, the use of the operational amplifier A for audio preamplifier circuit. The advantage is small size, low noise, low power consumption, good consistency. A operational
GF2A op amp audio amplifier circuit diagram - schematic

amplifier can achieve a deep negative feedback, while increasing output without distortion. The signal distortion below 1%; voltage gain of the amplifier up to 50 ~ 80dB. Wherein, cl is the high frequency compensation capacitor, c2, R2 decoupling filter circuit. Adjustment potentiometer RPl balances CMRR. Potentiometer RP2 negative feedback element. RP2 adjust the output level can be changed. Component selection: capacitance cl as 82P, c2 to 100p/25v. Resistor R1 is 27kn, R2 is 100n, R3 is 50kn. Potentiometer RPl10kn, RP2 is 100kn. Integrated operational amplifier A with GF2A. Transformer T with Crystal Hugh tube radios commonly used small output transformer instead.




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