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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SIDAC surge tester (CB4246E)
This surge test circuit was found in a 1980s ON Semiconductor documentation. The circuit makes use...
Half Wave Fast Rectifier (CB15806E)
This is a rectifier for small intensity signals, and equivalent operational amplifiers can be...
Astable Transistorized Multivibrator (CB18539E)
This circuit is from a publication from the 60s. The transistors used are of the first commercial types,...