Suggested by a 1968 documentation, this circuit limits the current of a regulator and can be adapted to other currents. The transistors are from the era.
In an English magazine from 1977 we found this interesting touch bongo circuit that can be mounted...
This circuit was found in a British documentation from 1969. It can be implemented with modern...
January 2017 - New ROHM TFZV series of zener diodes is now available from Mouser Electronics. The...