Audio Amplifier Circuit – 15 Watts
The circuit shown here is of a simple Class-B audio amplifier based on opamp TL082, transistors TIP41 and TIP42. LM833 is a dual opamp with high slew rate and low distortion particularly designed for audio applications. This audio amplifier circuit can deliver 15 watt audio output into an 8 ohm speaker at +12/-12V DC dual supply. Both opamps in the IC are used here. IC1a is wired as a buffer and capacitor C3 does the job of input DC decoupling. Ic1b is wired in the inverting mode and it provides negative feedback. Complementary power transistors TIP41 and TIP42 are wired in the Class B push pull scheme and they drives the loud speaker. Diode D1 provides 0.7V bias voltage for the push pull pair and capacitor C2 protects the 0.7V bias voltage across D1 from heavy voltage swings at the IC1b’s output.