Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is emitting signals. The sensor is a general-purpose type found in many electronic devices.
This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The...
This amplifier for automotive use was found in the SGS manual of linear integrated circuits of...
This SCR circuit can operate on frequencies from 1 to 20 kHz. We found it in an American...