This circuit activates a buzzer when the voltage applied to the input falls below a preset value in R1. The circuit is from an 80's American documentation.
Found in the March 1992 Radio Electronics magazine, this circuit has two supply voltages. The...
This 12V stepper motor controller was found in the August 1996 Electronics Now magazine. The...
In the figure we have a very sensitive touch switch circuit. A touch of the sensor causes the...