Found in a 90s American documentation, this circuit that was used in cars of the time, detects low temperatures and light by activating a warning relay.
This filters blocks radio interference or noise coming from the AC Power line. Noise such as the...
Found in a 90s Popular Electronics, this circuit triggers a relay in case of overvoltage. Can be used as a...
We found this sophisticated home alarm in a 1994 documentation. The circuit supports sensors of...