Intelligent battery charger (CB7130E)

Suggested by Radio Electronics from the 90s, this circuit is suitable for NiCAd batteries with a low battery indicator and a charge indicator.

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Geiger counter with high voltage source (CB22333E)
This circuit includes a high voltage inverter to power a Geiger tube. We found it in an American...
LC Oscillator Shield (CB18930E)
This circuit generates a signal up to a few megahertz depending only on the LC resonant circuit...
Programmable Frequency Divider (CB11870E)
With the CMOS circuit shown, rectangular signals up to a few megahertz can have their frequency divided...