This interesting sensor for RF signals was found in an article in the June 1989 Radio Electronics magazine. It is a field strength meter with an LED bargraph indicator.
Mouser Electronics owns the Texas Instruments DRV832x 3-Phase Gate Drivers capable of controlling...
This variable filter that lets frequencies from 500 Hz to 1500 Hz pass through was found in a...
Found in a 73 magazine for radio amateurs of the 90s, this circuit provides a 2 kV voltage with 7.5...