This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two Hall effect sensors of the time. It can be assembled using modern equivalents.
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...
This high input impedance circuit uses a symmetrical source. Found in the October 1993 issue of...
Currents up to 1.5 A can be regulated with this circuit. The resistor R that determines the...