Found in the December 1986 issue of Radio Electronics magazine, this circuit is designed to select 4 outputs with pulses from a pressure switch. The circuit includes LED indication.
This circuit synthesizes a sinusoidal signal from logic pulses that can be obtained from an...
With the light falling on the LDR, the relay closes its contacts by activating a warning system. The...
This circuit was found in old English documentation. It can be improved by using resistors of...