Found in a Popular Electronics from the 90s, this circuit applies to flashes with xenon lamps. The transistor admits equivalent and the phototransistor is of the Darlington type.
This circuit can be used with common transistors, from general purpose to medium power. The...
This configuration can be found in almost all LM117 manufacturer's manuals. This circuit,...
This circuit was published in Popular Electronics from the 90's. The components are common, as...