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 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...