This alarm circuit with NC sensors in series was taken from an article in Radio Electronics magazine from May 1971. The SCR can be any of the 106 series.
This circuit is intended to trigger a TTL door or flip-flip from a signal coming from an SCR....
This circuit is from a 1979 publication. The sensor consists of plates or screens that, when...
Bipolar transistors are types of general use like BC548, while the power MOSFET can be of any type...