Sensitive Crowbar (CB5887E)

This circuit is from an 80's documentation, firing when the input voltage exceeds 5 V. The SCR can be the TIC106 need not have a heatsink.

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Half wave rectifier (CB9696E)
This circuit was obtained in a 90s documentation. However, it can be developed with modern...
Low frequency crystal oscillator (CB9635E)
This circuit uses a 455 kHz crystal or for close frequencies. We found it in documentation from...
Darlington Automatic Shutdown (CB25614E)
This circuit turns off after a time that depends on C1. The circuit is from an Electronics Now...