This Low-power amplifier circuit have built in loudness control, driver amplifier Q1, and the bass/treble controls of around ± 10 dB boost / cut. It would be useful in a wide variety of situations. Either displayed ac supply can be used, or 12 VDC supply can be connected to points A & B (positive) and C (negative).

For stereo circuit can be used two of this circuit by using ganged potentiometer at R2, R7 and R11. T1 is 12V at 1 ampere plug-in transformer.

Notice :
IC1 should be mounted with the heatsink. Power output is around 5 W.
A 4 “x 2” x 0.050 “aluminum heatsink should be sufficient.

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The Low Power Amplifier  2 x 100 mW circuit is based on the combination of op amp and an output stage push-pull with two transistors to charge more than a few mA and assuring to have few mW required for comfortable listening.

The voltage gain is about 10 (20 dB), and corresponds to the ratio of resistors R3 / R2 for the left channel and R7 / R6 to the right path.

Power is supplied by a battery, creating a virtual ground prevents the use of a balanced power :

Note :

• Wiring of the terminal unless the capacitors C1 and C4 to ground and not to terminal -V.
• Increase the value of these capacitors C1 and C4, 1 uF 10 uF they pass, for an optimal in the low (cut-off frequency in the low end was a bit too high).
• Decline in value of the capacitors C2 and C5, 1 nF to 470 pF they pass (cutoff frequency in the high end was a bit too low).

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