This circuit digitally counts input pulses. The circuit from a November 1970 Radio Electronics uses unijunction programmable transistors. Note the counted pulse duration.
This digital indicator circuit was found in the June 1988 issue of Radio Electronics magazine. The circuit...
This powerful amplifier with 2N3055 transistors at the output provides a few tens of watts rms on a...
This simple logic level tester was found in Radio Electronics from the 90s. The inverters are of...