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 is the basic configuration of an operational amplifier sample & hold circuit. The FET and...
This transmitter emits signals in the FM range, reaching a few meters away. The modulation...
This low distortion circuit was shown in the July 1983 issue of Radio Electronics magazine. The...