D90 is a 0-ohm jumper thats testing fine. It doesn't matter if D90 is installed or not. As long as C704 is installed, the amp does not power correctly. I also tried C703 adjacent to C704 and no difference. C704 appears to be the cause but it doesn't make total sense why.
Hmm. C07 only measured 4uf. I replaced it with a new 10uf cap and the amp powers up now with both C07 and C704 installed (All components in circuit). The PS struggles only for about 2 seconds; drawing close about 16A then settles down to idle. I feel like this could either be the fix, OR it could cause power-on FET stress over time.
Should I try a 22uf cap in C07 perhaps?
Should I try a 22uf cap in C07 perhaps?
Does the amp struggle without the class D driver board?
Do the PS FETs from one transformer heat up during the time when the amp struggles?
Do the PS FETs from one transformer heat up during the time when the amp struggles?
AHHH junk this thing lol.
With my small PS things were going positive with the caps in, so I moved the amp over to my larger fused bench. The amp immediately in-rushed 200A on rem and instantly blew all 12x new IRFZ44. Synced up and all. The fuses blew but it was too late for the FETs. Like a light switch they all went up in smoke like I shorted them directly across a battery.
Back to square one. I'm going to put this one aside for a few days.
With my small PS things were going positive with the caps in, so I moved the amp over to my larger fused bench. The amp immediately in-rushed 200A on rem and instantly blew all 12x new IRFZ44. Synced up and all. The fuses blew but it was too late for the FETs. Like a light switch they all went up in smoke like I shorted them directly across a battery.
Back to square one. I'm going to put this one aside for a few days.
When testing again on your small supply, confirm that pin 4 never goes,even a fraction of a volt, below ground.
For a current limiter, on higher current supplies, you can use something like a few feet of 14g wire in the B+ line. It doesn't offer much resistance but can be enough to help protect the FETs. It's also possible to use a length of larger wire to make a current-shunt like breaker. But that takes building a small circuit.
For a current limiter, on higher current supplies, you can use something like a few feet of 14g wire in the B+ line. It doesn't offer much resistance but can be enough to help protect the FETs. It's also possible to use a length of larger wire to make a current-shunt like breaker. But that takes building a small circuit.