Guru
Joined: 08/10/2011
Location: AustraliaPosts: 2498
| Posted: 10:47pm 25 Mar 2017 |
Why don't you try the method I put up using the oven for 5 minutes, no toner transfer paper required and works very near 100% perfect. I have polished it with a cloth after etching and apart from scratching or using acetone the toner will not move and it is completely impervious and the end result is very near perfect.
The MOSFETs did not fail but it had spikes in the waveform and idle current went through the roof. I only ran it for a few seconds like that and shut it down. How the caps could cause the fault is a mystery to me as far as I know all they did was make more current available. Before turning on the inverter there was no current flowing.
I have the same circuit on a reduced size board with just 8 MOSFETs in total and 4 of the same capacitors and it runs like a dream.
There are only 10 types of people in the world: those who understand binary, and those who don't.