9 + 9 Volts
SINGLE IC AUDIO PREAMPLIFIER PARTS LIST
C1 = 0.1 uF disc capacitor C2 = 4.7uF electrolytic capacitor IC1 = LM358 single-supply dual op-amp
MIC = electret microphone R1, R3, R4 = 10K R2 = 1K
R5 = 100K to 1M potentiometer