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 memory flip-flop must be powered by 5V voltage. The circuit stores 1 bit. ...
Originally designed for use in an FM receiver, this 1990 circuit can be adapted for other types of...
This circuit, found in ancient US documentation, allows you to switch the antenna from the...