The purpose of this circuit, which we found in the November 1986 Radio Electronics issue, is to determine the voltage across a zener diode. Several test currents can be selected.
This simple circuit can be used in a robot that follows the light directly feeding a small motor....
We found this circuit in Radio Electronics magazine from May 1962. The circuit uses rectifier...
We found this circuit in Mullard's 1960s transistor manual. The circuit oscillates at 800 Hz, the...