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.
Found in old documentation, this circuit can generate pulses from 400 to 4000 Hz with active cycle...
Mouser Electronics has in stock the MUSBR robust connectors for USB 30 applications from Amphenol. These...
The frequency of this transmitter depends on the coil. For 100 turns the operation is in medium...