2n2222 Audio Amplifier Circuit By Johana December 06, 2022 Post a Comment 2N2222 Audio Amplifier Circuit . The collector of the q3 is coupled to the base of q2 (2n2905a),which forms a. Resistors r6 and r7 provides potential divider biasing for q1. R4 and c4 form a lowpass.… 2n2222 amplifier audio circuit