Ripple Filter (CB6724E)

This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according to the desired output voltage and current.

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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...