Simple logic test (CB10027E)

This simple circuit can make use of any general-purpose transistor. The power comes from the circuit being analyzed.

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Parallel Multi-Loop Alarm CIR13989S CB6652E (CB6652E)
We found this circuit in a Popular Electronics of the 80's. The circuit can be used to drive...
Simple Electronic Thermometer (CB525E)
This circuit can also be used as a simple thermoscope (temperature changes indicator) in the...
Who’s the Fastest (CB14987E)
This speed or priority switch set uses two LED indicators and two SCRs in a common configuration. The...