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Summary of change:
Hi, I've assembled the PCB and upgraded the firmware. All was well with only a 1 amp fuse needed in the power feed to pin 25. I then fitted it to the case and clamped down the FETs and IGBTs. It blew the fuse in the feed to pin 25 as soon as I powered it up:( I removed it from the case and the PCB is still drawing 2.5 amps. If anyone can suggest what to check.....
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