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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