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Old 8th November 2008, 01:46 AM   #21
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right they are flipped on opposite sides of the board, right?
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Old 8th November 2008, 01:47 AM   #22
Magura is offline Magura  Denmark
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Quote:
Originally posted by fligti91
here is my heat sink, how do you think ill be with this?
Click the image to open in full size.

That is not much for two channels. You are going to dissipate close to 300W of heat, if you stick to the 0R22, as in 3A bias.


I used something like 6 or 8 times that, and still I had it running at the wrong side of good.


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Old 8th November 2008, 01:48 AM   #23
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Quote:
Originally posted by fligti91
right they are flipped on opposite sides of the board, right?

Yes, so the trick is to figure which is which, hence the trick about looking for where R1 is connected.


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Old 8th November 2008, 01:48 AM   #24
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holy crap! ill have to order some higher value resistors then
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Old 8th November 2008, 01:49 AM   #25
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Quote:
Originally posted by fligti91
holy crap! ill have to order some higher value resistors then

Don't you have some extras of the 0R22 ?


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Old 8th November 2008, 02:42 AM   #26
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nicely sleuthed Magura
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Old 8th November 2008, 03:31 AM   #27
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ok so i powered it up with the pins soldered correctly. the 6 amp fuse blew right away. so i disabled one channel and the fuse didnt blow. and i checked for voltage at the drains and found 22v(half of the input). after letting it sit for a minute like that i came back to it and found the drains to be at the same as the input voltage 43v. this is driving me nuts! i obviously screwed up the mosfets wiring originally but now im thinking i blew them because of it???
you all have been a great help and have already shown me where i was wrong, please dont give up on me, lol.
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Old 8th November 2008, 08:38 AM   #28
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Quote:
Originally posted by fligti91
ok so i powered it up with the pins soldered correctly. the 6 amp fuse blew right away. so i disabled one channel and the fuse didnt blow. and i checked for voltage at the drains and found 22v(half of the input). after letting it sit for a minute like that i came back to it and found the drains to be at the same as the input voltage 43v. this is driving me nuts! i obviously screwed up the mosfets wiring originally but now im thinking i blew them because of it???
you all have been a great help and have already shown me where i was wrong, please dont give up on me, lol.

I didn't give up on you, but we have a few hours time difference.


Does the voltage at the drains change at all when turning the potentiometer?

Usually when running mosfets this hard, you have little doubt if they're goners, but it's been seen that they die silently.

The easy solution (if you have the parts) is to replace the mosfets. The a bit more complicated solution, is to remove the mosfets from the circuit and test them.

Here is a guide: http://www.passdiy.com/pdf/mos.pdf


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Old 8th November 2008, 07:17 PM   #29
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would you all have a recommended part number for an inductor to use on my 43v to bring it back down to the 34 v the circuit was designed for? im going to have to order some new mosfets and power resistors
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Old 8th November 2008, 08:13 PM   #30
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You can't reduce the voltage that much with an inductor, but the voltage is not really a problem. I usually play with stuff like this, pushed about as hard as you do here.

Just order some 0R33 and 0R22, and a bunch of mosfets, since you're going to build something more fun later anyways
A few MPSA92 may also come in handy.

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