This simple circuit is a continuity test that, in addition to testing resistors, can also test other components. Power is provided by batteries and the LED can be of any color.
This sensor circuit from a 1967 Ferranti documentation uses components from the era. The circuit...
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
This circuit eliminates hiss and other noise from audio sources by cutting frequencies above 10...