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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Sample and hold 3 (CB10108E)
This sample and hold circuit configuration was found in a manual from the 70s. The operational amplifiers...
Temperature Alarm (CB536E)
When the temperature rises above the value adjusted by P1 the relay triggers on. The rated voltage for the...
Crystal Colpitts Oscillator (CB11527E)
This circuit was found in Radio Electronics from February 1993. The circuit can be implemented with other...