This is the receiver from the previous alarm system. The circuit is from Radio Electronics, April 1989, and has an LDR as the sensor. Optical devices should be used to improve performance.
This circuit, which is present in other points of this website, was found in a 90s Hands On...
E) The interesting thing about this circuit found in a 1985 English magazine is that it controls the...
This converter converts signals from the 50 MHz band to the AM band, making it possible to receive...