hillzofvalp wrote:FOUND BIGGEST HINT:
Discharging the cap bank completely turns off fet bank. I have the IRF510 driver firing fine. Fets are not turning off unless I discharge the caps. Almost like the caps are supplying gate-source threshold.. maybe a diode from driver fet drain to fet bank gate?
amberwolf wrote:If the cap only has less than a volt on it, most likely it's not getting charged up, so you would wnat to look at it's supply and connections. If the main supply does not have any voltage when connected, but does when it isn't, maybe the SCR is shorted on (or being forced on by somethign shorting the trigger on)?
amberwolf wrote:If the cap only has less than a volt on it, most likely it's not getting charged up, so you would wnat to look at it's supply and connections.
Kin wrote:I think buying the caps new tend to not be an option unless you're willing to pay quite a bit more. These are expensive parts new, but widely available surplus. You won't have as many electronic surplus stores in hawaii (i imagine), but you still might be able to source used car audio caps or from whatever electronics surplus areas there are. You will really have to look around. I'm still struggling to find enough caps around where I live for a cheap enough price.
1) Hope the 2 farad caps are enough. If they are real farad caps it could be enough (look at the link, he has some success with 1.5 farad but is much happier when he goes to 5 farad).
2) Look into the higher voltage version. 2F at 24v is the same energy as 8F at 12v. What are those caps you're using rated to? (don't use them at the limit of their voltage! Caps can blow quite quickly above their max; some conditions can cause such a voltage spike).
texaspyro wrote:I have tested DOZENS of different car audio caps. The ONLY ones that met their rated specs are the 1F caps from Rockford Fosgate, Monster Cable, and Scosche. And ONLY their 1F caps. ALL the others that I tested were bogus. Many as low as 1/20th of their rated capacitance. BEWARE!
See: viewtopic.php?f=2&t=2633&start=810#p494786 for some of the testing results.
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