Crowbar for power supply (CB8367E)

This protection circuit was obtained in a 1969 Electronic Design. The SCR can be the current equivalent, depending on the fuse current.

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Shield for triac (CB26126E)
This shield with full-wave triggering was found in the Radio Electronics Experimenter magazine of 1989....
Metal Finder (CB25719E)
When operating near a medium wave radio, the signal frequency changes and this can be heard on the...
FET Micro Transmitter (CB19440E)
This FM micro transmitter was found in an 80s spy book. The circuit can work with equivalent FETs...