The sensor is S1 in this alarm that we found in a Radio Electronics magazine from May 1971. Several sensors can be used in series. The SCR supports equivalents from the 106 series.
Found in a documentation from the 90's, this circuit uses only one integrated circuit. The...
This power supply originally created for the CB16776E project but can be used for any type of 12 V...
The original purpose of this circuit, which we find in old American documentation, is to modulate an...