Delayed Pulse Generator (CB6470E)

This circuit was found in a 1967 documentation. The switch diode is a component of the time and is difficult to find today.

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Electronic Compass (CB25382E)
This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two...
20 A Battery Charger with Charge Control (CB4973E)
We find this circuit in an American 1980s documentation. The unijunction transistor may be the...
Sources for LEDs
May 2017 - Mouser Electronics supplies a wide range of sources for LEDs from Mean Well with inputs for...