This circuit was found in the February 1980 issue of Radio Electronics magazine. The digital circuit was shown in two parts, using 20 LEDs in a configuration with the LM3914.
This circuit provides a power of the order of 2 W, characterized by high performance. The output...
Suggested by an old Popular Electronics, this circuit is based on an uncommon integrated today,...
This small preamp for low impedance microphones was found in a Popular Electronics from November 1968....