This circuit is from an American publication of the 80's. It makes use of components of the time. However, the circuit is the basis for a modern shield application since the input is TTL.
This circuit can be used in AM and FM receivers to cut off the peaks of a signal functioning as a limiter...
When the sensor, an ordinary photo-transistor, receives light, the relay closes its contacts. The...
This circuit transforms your low sensitivity analog multimeter into an electronic voltmeter with...