This circuit is the digital indicator for the previous circuit and can be used with similar circuits. The circuit is from an article in Radio Electronics magazine, June 1987.
This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made...
This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a...
Using a CA3030, this circuit was found in the May 1988 Radio Electronics magazine. The power...