Field Effect Transistor (FET) Projects: Product Detector for SSB and CW
G3YNH: Digital Readout & All-Mode Adapter for RAcal RA17, part 2.
Product Detector Components - YouTube
Amazon.com : Metal Detector for Adults, Professional High Accuracy Waterproof Gold Detector with LCD Display, 10" Coil Adjustable Metal Detector for Treasure Hunting, 5 Modes, Advanced DSP Chip : Patio, Lawn & Garden
Communications Receivers. Detector Circuits.
Product Detector Components
Product Detector
Digital Envelope Detection: The Good, the Bad, and the Ugly - Rick Lyons