This Texas Instruments circuit is from the 80's. However, it can be implemented with modern operating systems. The power supply must be symmetrical.
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...