This circuit was found in an American documentation from the 80's. The components are from that time. It provides a variable output of 18 to 30 V with a current of 200 mA.
Using a V/F converter this circuit was found in the June 1991 issue of Radio Electronics magazine. The...
The main feature of this circuit found in an old American publication is that it is powered by the very...
This circuit using the CK722 among others came out in a September 1950 Radio Electronics. It was...