This polarity inverter circuit for voltages down to about -12 V was found in the December 1992 issue of Radio Electronics magazine. The current is a few mA.
This source regulated with transistors appeared in an American publication from the 1980s. The...
This regulator or voltage reference consists of a variable zener diode. We found it in the June...
This is a change from the previous interface, also used an uncommon operational one today. The...