This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a company 567 which is still a common component.
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...