Circuits similar to this can be found in this section. This is from 1967 General Electric documentation. The main SCR must be fitted with a heat sink.
This circuit is from the American magazine that no longer exists Science & Electronics,...
This circuit, from an old ON Semiconductor publication, suggests a shield to excite an LED from an...
Using the Linear Technologies LT3080 IC we have a constant current source with a 10 V voltage...