This source was originally suggested by Delco in a 1969 documentation to power amplifiers up to 50 W. The transistors are of the time admitting modern equivalents.
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
This circuit provides an output voltage with the absolute value of the charge and discharge current...
With the figure circuit it is possible to control the amount of heat generated by the heating...