This circuit was found in a Popular Electronics from the 90's. The operating curve is given next to the diagram. The power transistor must have a heat sink.
We found this circuit in a 1980s publication on telephony. The circuit uses an integrated...
Texas Instruments' low power operational amplifiers OPAx196 can be found on Mouser Electronics....
This circuit converts a positive CMOS supply voltage to a negative one. We found it in a 90s...