Found in a Popular Electronics from the 1990s, this circuit monitors the voltage of a power supply or battery. The trigger voltage is adjusted with a potentiometer.
This circuit was proposed by a 1965 Electronic Design. Its purpose is to widen the line transients...
We found this receiver in old documentation. The transistor is made of germanium and the...
This simple battery tester uses two transistors to drive LEDs of different colors, indicating the...