Balanced amplifier (CB7396E)

This circuit was found in Sgnetics documentation from the 80's. The circuit also has loudness control. The power supply must be symmetrical.

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500 mW push-pull amplifier (CB21795E)
This circuit was found in a Mullard transistor manual from 1960. Note the symmetrical power...
Speaker Remote Control (CB23765E)
With the shadow over the sensor, it is possible to interrupt the sound of your amplifier using this...
Power supply backup (CB24890E)
This circuit puts the battery in the circuit when the voltage of a source is cut, preventing it...