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Old 31st May 2008, 10:35 PM   #41
luka is offline luka  Slovenia
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Hi

Are going to keep this kicker or is amp8 still on?
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Old 1st June 2008, 03:09 AM   #42
djQUAN is offline djQUAN  Philippines
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this is going to replace amp8.
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Old 1st June 2008, 07:11 AM   #43
luka is offline luka  Slovenia
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Hi

Sweet, hey can ypu put in even larger cores? I mean you should keep temp donw as much as possible, summer day with can on sun you will have over 60C insude anyway + if operation heats it up that much...nothing good could happen
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Old 1st June 2008, 04:37 PM   #44
djQUAN is offline djQUAN  Philippines
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yup. that's why I'm waiting for the bigger T130 MPP cores to arrive. but I'm getting impatient.
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Old 1st June 2008, 09:50 PM   #45
luka is offline luka  Slovenia
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Hi

I know the feeling When will you get them? Will you still stuck them?
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Old 2nd June 2008, 10:01 AM   #46
djQUAN is offline djQUAN  Philippines
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I'm not sure. I had my cousin in the US to buy them. don't know when they will be shipped here.

I'm going to use two stacked cores.
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Old 2nd June 2008, 02:53 PM   #47
djQUAN is offline djQUAN  Philippines
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guys,

can anyone recommend a good online store that sells IRF3205's in good price as I want to buy around 50-100pcs. preferably in the US as I'm gonna get my aunt to buy the parts when we go over there....
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Old 6th June 2008, 08:39 PM   #48
djQUAN is offline djQUAN  Philippines
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we have a problem here.....

I did some calculations based on the formulas eva posted here before and the results surprised me....

(80V is rails at 13.8V input, 104V is rails at 18V input)

1pc Material 60 T150
area: 0.887cm2
volume: 8.31cm3
mag lenght: 9.38cm
turns: 44
inductance: 125uH

B=666.188378 gauss @ 80V
B=866.044892 gauss @ 104V
H= 235.779957 Oe @ 80V
H= 306.513944 Oe @ 104V
est. core loss 80V = 2.05W
est core loss 104V = 2.67W



2pcs Hi Flux T106 stacked
total area: 1.318cm2
total volume: 8.56cm3
mag lenght: 6.49cm
turns: 22
inductance: 177uH

B=1557.63gauss @ 80V
B=2031.70gauss @ 104V
H=170.386441 Oe @ 80V
H=221.502373 Oe @ 104V
est. core loss 80V = 6.93W
est. core loss 104V = 9.04W



2pcs MPP T130 stacked 66nH/t2
total area: 1.396cm2
total volume: 11.56cm3
mag lenght: 8.28cm
turns: 37
inductance: 177uH

B=5033.69gauss @ 80V
B=6543.79gauss @ 104V
H=224.609 Oe @ 80V
H=291.99 Oe @ 104V
est. core loss 80V = 13.96W
est. core loss 104V = 18.16W


so it looks like I really have to buy the original cores for the amp and the MPP ones will be much worse than the hi-flux. big problem is I don't know where!!!!

edit: I'm not sure if I computed the core loss correctly since I can't find a graph so I indicated "est." (estimated) as I just put together a formula using ratio and proportion to come up with an answer.
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Old 6th June 2008, 08:57 PM   #49
luka is offline luka  Slovenia
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18v input? are you sure it can handle it? anyway you won't have 18v, 14v at best, right?
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Old 6th June 2008, 09:31 PM   #50
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yup. all input and output PS caps are rated to handle that. 18V is used by dbdrag competitors. I just wanted to be sure that I have enough margin to operate safely and when I decide to sell this, that I know it will operate as the original amp did.

I measured 14.2V highest in my car. drops to 13.8V most of the time.

my problem right now is that I looked on all online sources that I could think of and none of them carries the -60 material. looks like I'm going to request a sample or go to the micrometals factory directly if all else fails. (I'm going to the US sometime in july or august)

Eva, I need help here. surely you must know a place that sells -60 material.
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