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.
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...
This is the basic configuration of the TDA200. We found this application in an article in the...
This circuit can be applied to other 3-terminal regulators and equivalent transistors can be used....