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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Generator for the MW band (CB25718E)
This circuit can be used both as a beat oscillator and for testing and adjusting AM receivers for...
Sound of Phasor 4046 (CB25766E)
Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994...
Battery na alternator monitor (CB7136E)
Found in a 1991 Hobbyst Handbook, this circuit monitors both battery and alternator voltage. The set...