Active three-tone filter (CB20808E)

This circuit was found in an American documentation and can be added to common amplifiers of any type. The transistor can be any general purpose.

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Telegraphy practice Oscillator (CB23677E)
This simple circuit is from a Radio Electronics from July 1965. The circuit can be assembled with...
Delayed start alarm (CB24379E)
Found in the May 1975 issue of Radio Electronics magazine, this circuit turns on after a certain...
Bootstrap with capacitor (CB8939E)
We found this circuit in a 1965 General Electric documentation. The circuit generates synchronized...