This circuit triggers an alarm in the event of a power failure. The circuit is from an 80's documentation, being powered by 9 V battery. The parts are common today.
This thermal control circuit appeared in Radio Electronics magazine in October 1958. The circuit is...
This circuit, from an old publication, can employ silicon transistors like the BC548 and the...
June 2017 - The new TE Connectivity FSJMI series of illuminated tactiles switches is now available in Mouser...