This circuit was found in an American 1980s documentation. The transistorized step is the receiver's last IF and the diode is the receiver's existing detector.
This circuit, from a publication of the 1970s, can compare the intensity of two light sources,...
May 2017 - Qorvo QPL9065 low-noise amplifiers can be purchased from Mouser Electronics for a...
August 2017 - The new LZ400UB00 ultraviolet LEDs from Engin LEDs with wavelengths of 385 -410 nm...