We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the time and the diodes in the dotted board must be mounted on the output transistor heatsinks.
This alarm uses several sensors that directly trigger a sensitive relay. A larger relay can be...
This power supply was found in the December 1993 issue of Electronics Now magazine. Power...
This circuit is from Radio Electronics from March 1985. The circuit uses common components at the...