This physical line servo control uses components that are not currently common. The circuit is from an 80's documentation and is powered by a voltage according to the servo.
Found in 90s Popular Electronics, this circuit fires an old camera flash of the type with a xenon...
The circuit shown in the figure is triggered by an input voltage determined by the setting of P1....
This is the circuit of an automotive voltage regulator from the 1970s. The circuit is entirely...