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 control circuit for direct current motors uses a 741 and an operational one of unusual power...
This is the traditional voltage follower configuration with the 741 operational amplifier. The...
This type of configuration can be seen elsewhere in this section. This is from a 1965 General...