I have a 240v to 12v transformer even bigger than a microwave transformer and i want to control how long it is switched on for in the range of 50-300 milliseconds to spot weld things.
I was thinking of a big momentary push button switch same as thet have on factory walls to control robots, that i can hit a bit like swatting a mosquito at different speeds in order to get different contact durations.
Perhaps i could make a switch to control the transformer input, out of wood, copper and some silicone rubber springs? to finely adjust the physics of the spring to change it's rebound depending on how it is wedged?
Is it a feasable DIY experiment? would a switch on the AC side be too imprecise, seeing as the AC phase is 20ms and i need to let through 5-10 periods of AC into the transformer, is it not logical?