2 kW Control (CB21374E)

This power control was found in a 1968 power circuit manual. The SCRs are according to the power of the controlled load.

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Zener Diode Tester (CB22160E)
This zener test circuit was found in an English publication from 1989. The circuit tests zener up to...
10 note synthesizer (CB8442E)
This circuit was found in a 1991 PE Hobbyst Handbook. The components are still common and each...
Transistor Tester (CB17229E)
We found this circuit in a 1998 publication. It consists of a simple test of transistors using an...