I had given up on getting a reply as I was waiting on an email notification but never got one
Glad I checked in. Thanks for the support.
Makes sense. I wouldn't know where to start with trouble shooting the low voltage power supply section so I might discard the board and start again unless someone could point out something obvious...
Having said that, could I just solder up the fets (no heat sink), attach hall wires, throttle wires, power and phase wires and test it like this somehow before I build it up any further? To save my self the time if something ain't right from the start? I have a 16v 40amp power supply I can limit both voltage and current with.
Oh, I just realised something. I was limiting the current to 1 amp when I first fired it up. I used the above PS and slowley turned it up form 0v to 16. with it not working i then tried 50v from battery. Could the current limiting caused voltage to rise and cause the failure? I don't think so because the reg should have still dropped the voltage to 5v right? Thought I would ask though...
Thanks again for the guidance AW. Any more you or anyone can provide is much appreciated