This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply voltage should be according to the relay used.
This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of...
This circuit can be used with 3 receivers and is intended for low frequencies (medium wave range). We...
This useful benchtop power supply uses a single LM350 integrated circuit as a regulator. The...