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 :
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