This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This simple circuit was found in the Spanish magazine “Todo Electronica”, in an edition of 1996....
The basis of this circuit is a National Semiconductor operational amplifier that functions as a...
A high-frequency square wave oscillator using an LC-tuned circuit is shown here. The upper...