We found this circuit in documentation from the 90s. It is a common configuration that is given in two versions, using transistors and using two integrated inverters.
The transistors of this 12 V x 150 mA power source can be BC558 for PNP and BD135 for NPN. The...
This adding amplifier with the operational LM324 is from the SGS integrated circuits manual of...
This circuit was found in a 1973 documentation, being able to use any general purpose NPN...