Voltage comparator (CB22152E)

Found in old English documentation, this circuit can be built with BC548 transistors.

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Radiation monitor (CB5923E)
This wide-range radiation monitor was found in a 1980s documentation. The circuit uses a diode as a...
Crazy Game (CB18024E)
We found this circuit in a 2003 documentation. The purpose is to make the player choose one or two...