- 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.
NOTES:
- The audio amplifier circuit must be assembled on a good quality PCB.
- Use a holder for mounting IC1.
- Use a +12/-12V dual supply for powering the amplifier.
- Potentiometer R2 can be used as a volume control.
- Raising the power supply voltage will increase the output power. Anyway note the following points.
- TIP42 and 41 can handle only up to 6A.
- Maximum supply voltage IC1 can handle is +16/-16 V DC.
