What do you mean when you say the supply collapses? I see a voltage drop across the supply when I turn on initially. Is this it? I am running with a bench supply but tried a large car battery and found the dip decreased a lot. Adding 1200 uF of capacitance across the bridge supply helped a lot too.
The ringing I see seems to be after the dip and recovery of the voltage.
The ringing I see seems to be after the dip and recovery of the voltage.