The circuit shown here is of a simple Class-B audio amplifier based on opamp TL082,
transistors TIP141 and TIP142. 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
Read more: http://www.circuitstoday.com/15w-class-b-audio-amplifier#ixzz1PgCb5tTk
