Continuity Test (CB18281E)

The circuit in the figure is a useful continuity test serving to check the condition of circuits and components with excellent sensitivity.

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On Off Control (CB15047E)
This bistable control uses a 4069 as bistable. The circuit can drive relays up to 100 mA with the...
Transistor Tester (CB19586E)
This transistor tester with different gain ranges was found in documentation from the 1980s. The...
Instrumentation High Impedance Stage (CB13413E)
We found this circuit in a 1976 documentation. The FET can be the BF245 and the bipolar transistor a...