This is the receiver for the earlier system published in the August 1988 Radio Electronics magazine. Optical capabilities can be used for extended range.
Found in Philips' 90s documentation, this small source can use modern transistors like the BD135...
This circuit is designed to activate an automotive alarm after 8 minutes of activation. Of course...
June 2016 - It can be purchased from Mouser Electronics the new triacs Z04 for 4 A from...