Continuity tester (CB7386E)

This circuit was found in a Hands-On Electronics from the 90's. The FET can be any general purpose.

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Negative Bias Source (CB6736E)
This circuit provides a negative supply for circuit biasing. The current is very low. The voltage...
Comparator with Hysteresis with the LMV321 (CB4747E)
This very low voltage circuit with the LMV321 was obtained from its own datasheet. The circuit can be...
Electromechanical Totalizer Powered by Light (CB12099E)
This circuit was found in a Modern Electronics from 1990. It activates an old electromechanical pulse counter,...