This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made at R6. Supply voltage is matched to that of the relay.
Found in an Electronic Design, this circuit makes use of general-purpose bipolar transistors. The circuit...
August 2017 - Mouser Electronics is offering a new range of Ohmite ceramic heat sinks. The new...
This instrument was obtained in a documentation for radio amateurs of 1976. The circuit measures...