Using a MAX644 this circuit was found in the April 1989 issue of Radio Electronics magazine. The circuit is for a 5 V voltage and 50 mA current output.
This circuit with optical couplers was found in General Electric documentation from the 80's. The...
This circuit divides frequencies of up to about 7 MHz by 10 and by 100. The input signal must be...
Found in a 90s Electronic Design, this circuit is used with a 9 V adapter for powering small...