This circuit is from a 1975 RCA tube manual. It appears elsewhere on the site. R5 depends on the voltage of the amplifier with which it is used and can be changed.
Using the 709 integrated circuit, one of the first operational, this circuit was found in the...
This circuit can be used on a 0 to 14 V source with a current of 1 A. The PNP power transistor can be the...
The circuit presented is quite interesting due to the low-pass filter using the integrated circuit...