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Registered Member #54503
Joined: Sun Feb 22 2015, 10:35PM
Location: New Zealand
Posts: 288
Hi everyone, just getting back to my project after many months. I ended up buying another IGBT off ebay and reassembled my coil again today.
No idea what's wrong, but my coil is no longer working since one of the IGBT's died.
Is there anything else i should be checking after an IGBT failure? I believe the failure was caused on a floating gate, as i discovered that one of the cat 5 wires from the GDT had broken off the failed IGBT.
Im still getting a signal on the scope on the GDT outputs and on the bridge output itself also.
The scope shot below is taken from across the bridge, and the odd thing is i get the same waveform even if i remove the power from the bus!
Dont know whats going on here, but i think i might try and inject a signal from the signal generator into the UD board and see if that makes any difference. Right now my MIDI interrupter is simply emulating a spark gap coil in this screenshot.
Either way, i can hear the GDT making the usual buzzing noise when its being driven, so the feedback driver must be doing something right. Any ideas? TIA
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Have my bus caps died?
