Logic probe (CB10024E)

This circuit was found in documentation from the 1980s. Transistors are general-purpose types like the BC548 for NPN and the BC558 for PNP.

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Standing wave meter (CB23791E)
This is a circuit published in the January 1962 Radio Electronics magazine. The circuit is for...
NOR Gate with 1 Transistor I (CB19885E)
In the figure we have the simple way to implement the NO-OR or NOR function with common diodes and a...
Single timer (CB22497E)
This timer for short intervals was found in a documentation from 1966. The transistor is made of...