This RCA circuit has current limitation. The circuit is from an ancient American documentation making use of components of the era. The circuit includes the power supply.
This circuit was found in a 1973 publication. The SCR may be the TIC106 and must use a heat sink,...
This circuit is from the time when slide projects were used. We find it in a 90's Wels’ Think...
This circuit was found in a Radio Electronics Constructor, English magazine of April 1976; The...