100 V x 250 mA switched converter (CB9961E)

This circuit was found in a 1970s documentation. The components are from that time, and semiconductors are difficult to obtain today.

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Rhythmic LEDs (CB18204E)
We found this transistorized circuit in a 1985 documentation. The circuit can operate with...
CB26109E Amplifier (CB26109E)
We found this small audio amplifier in the November 1999 issue of Electronics Now magazine. The...
Tunnel Diode Listening Transmitter III (CB19427E)
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...