Suggested by Amperex in 1968, this circuit is intended for hearing aids. The integrated circuit used, a TAA370 is not common today.
We found this conventional source with power transistors in a 1997 publication. The output voltage...
This source, obtained in the 1982 SGS manual, has pre-regulation and provides a current according to...
We find this circuit in a technical documentation of 1976. The transistors can be the BD135 and...