Avalanche Oscillator (CB7112E)

Found in a General Electric documentation from 1970, this circuit consists of a relaxation oscillator that uses a transistor from that time.

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Flyback Tester (CB4644E)
Flybacks are no longer misused. However, if the reader wants to recover an old analog television...
Blown Fuse Alarm (CB4875E)
This 3V-only circuit was found in old American documentation, but can be implemented with...
455 kHz modulator with the 555 (CB7990E)
This circuit has a configuration that can be found elsewhere on this site. The power supply can...