This low-power circuit was found in the March 1990 issue of Radio Electronics magazine. It consists of a tone control solution for portable turntables.
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...
Found in a 90s Popular Electronics, this circuit aims to find the voltage of a zener diode up to...
Found in a Popular Electronics from the 90s, this circuit is suitable for testing and tuning...