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.
July 2017 - Mouser Electronics announced the availability of its new ISO771x digital isolators...
This circuit was found in an ancient American documentation. The components of the time are not...
This automotive circuit was obtained from an 80's schematic from the integrated circuit factory...