This 4-voltage power supply using zener diodes has a maximum recommended current of 25 mA. The circuit was found in the May 1966 Radio Electronics magazine.
This oscillator was found in the September 1984 issue of Radio Electronics magazine. The frequency is...
This simple 555 biofeedback circuit was found in the December 1983 issue of Radio Electronics...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...