A while ago I had acquired an old 8 amp selenium rectifier car battery charger.
I took the parts from that and built a new one.
Recently I found this Brumberger film carrier:
The timer I got is a Haydon Model ADI 1A001C D130302.
The unit has 2 black wires for 120vac 60hz and 2 spade connectors for the switch. The switch can handle 250vac 28 amps. The shaft is a standard D type.
I will use a 25 watt 10 ohm POT's so I can vary the input voltage to the transformer. This charger originally had selenium rectifiers so the output voltage is about .5 volts too high. I need to reduce that and do not have any diodes that can handle the 14 amps that this charger can put out before the self resetting circuit breaker kicks in. I want to vary the input voltage anyways to experiment with some of the charging methods I have been reading about. I only need to adjust between 1 and 8 ohms to reduce the input voltage from 125 vac to 115vac if needed. My wall voltage can get rather high sometimes. I do not want to use a variac. I also do not want to over complicate the charger with a DC voltage regulator.
The finished unit: