This single trigger circuit has been indicated for photography applications. The circuit is from a 1964 Electronics World. The transistor is general-purpose and the SCR can be of any type.
Using an integrated circuit from the time, this circuit was found in Radio Electronics from the...
This shield circuit is from old documentation. The operational amplifier used is not common today...
This circuit powers a small 5 W lamp that goes out when power is lost. The circuit can use the...