This stereo meter-indicator was found in the August 1971 issue of Radio Electronics magazine. The transistors are known types and BC548 equivalents can be used.
This simple PWM circuit was found in the March 1991 issue of Radio Electronics magazine. The...
Found in documentation from the 1960s, this circuit uses general purpose transistors that can...
At dusk this circuit triggers a relay switching lamps. The circuit can be powered from 6 to 12 V...