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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NiCad Charger (CB4979E)
This circuit is from an old American documentation using LEDs in the rectification. The circuit...
Stepped Low Voltage Power Supply (CB12732E)
This source only uses passive components (without transistors or integrated circuits) and even so it...
Digital Optical Counter (CB17363E)
This four-digit circuit was found in a 1990 documentation. The sensor can be a contact or reed...