24 Hour Clock (CB6462E)

This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at the time. The circuit is from a 1970 CQ magazine.

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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...