Suggested by Amperex in 1968, this circuit is intended for hearing aids. The integrated circuit used, a TAA370 is not common today.
Suggested by General Electric in a 1967 publication, this circuit makes use of an SCR of the time....
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
High Current Through Hole Inductors for Vishay's 5A Series IHXL-2000VZ-5A Series Power Supply are...