Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an inverted phase using a relay and a unit gain stage.
Suggested by a 90s Electronic Design, this circuit drains only 0.25 mA from its source. Listening...
This 2000 circuit can work with one of the many infrared remote-control transmitters described in this...
This circuit is primarily intended for the calibration of common radio IF steps using the...