This circuit was found in a 1964 Electronic Design. The components are of the time, and modern equivalents can be used. Note the multi-emitter transistor.
The RCA integrated circuit used in this control is uncommon today. The circuit is from an...
This physical line servo control uses components that are not currently common. The circuit is from...
This HeNe laser power supply was found in the March 1989 issue of Radio Electronics magazine. This...