Found in a 1993 Electronics Experimenter Handbook, this circuit uses a multimeter to measure capacitance. The circuit is powered by 12 V.
This relay circuit protects against accidental inversion of input polarity. The circuit was...
This 80's National Semiconductor circuit uses an era integrated circuit and symmetrical 5V power...
This circuit was obtained from Popular Electronics from March 1967. The transistor used is from...