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Old 29th April 2006, 01:08 PM   #41
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Nice find. That probably explains why all of the amps don't work.
Now clean that kitchen table.

/Hugo
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Old 29th April 2006, 01:12 PM   #42
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not so fast just one board i mounted at heatsinks after 2minutes started smoked , checked two resitors burned out both 221ohm. r6 and r44 in schematic
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Old 29th April 2006, 01:23 PM   #43
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I these are gate resistors, the corresponding mosfets are broken.
A gate resistor should always measure 0 volt across it, meaning no current should run.

/Hugo
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Old 29th April 2006, 01:34 PM   #44
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And don't apply power when not mounted on the heat sinks - you are likely overheating the junctions even when powering for a few seconds.
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Old 29th April 2006, 01:35 PM   #45
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Default 100 Ohm

Quote:
that was cool! Post #39
I checked all resistors and quess what- insted 100Kohm I soldered in 100ohm. how I did that? I carefuly mached resistors, BUT FORGET VALUES! i just put simply resistors back to pack paired. now I measured all left resitors in pack in both pack they are 100ohm. inspite on secon bag written100pieces 1% 100kohm!! is there any lawyers out there ? i think I will court my local shop fro things like theese. threy cut my life at least 5 years.
I turend on amp now for a few seconds and fets got hot , dc ofset reads 0,01v seems it should work.
Ughh....

Errr... You made a mistake. Look at this thead, how you
"doctored" your amp and measurements.
Now you blame your local shop.

No offence, but I am out.

Good luck
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Old 29th April 2006, 01:43 PM   #46
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Default Re: 100 Ohm

Quote:
Originally posted by rtirion
No offence, but I am out.
That must be a mistake.

/Hugo
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Old 29th April 2006, 02:19 PM   #47
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that was joke about shop, there no drugs or pharmaceutical against sillines and impatience. and only I am responsible for any my mooves.

and that resitors burned is not a joke.also 0,39 ohm one resitor down too. during that few minutes I measured across 0,39resitors(in good side that voltages was all 4 resistors diferent 0,49v and 0,36)

rtirion, really thanks for help , by one myself Iwould not find bugs. now I will try to see by myself where is problem. shouldnt be a big problem..
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Old 29th April 2006, 02:26 PM   #48
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Default Re: that was cool!

Quote:
Originally posted by elviukai
I checked all resistors and quess what- insted 100Kohm I soldered in 100ohm. how I did that? I carefuly mached resistors, BUT FORGET VALUES! i just put simply resistors back to pack paired. now I measured all left resitors in pack in both pack they are 100ohm. inspite on secon bag written100pieces 1% 100kohm!! is there any lawyers out there ? i think I will court my local shop fro things like theese. threy cut my life at least 5 years.
I turend on amp now for a few seconds and fets got hot , dc ofset reads 0,01v seems it should work.

sorry my writing mistake

instead 100kohm I soldered in 100ohm .I bought 2 packets from store labeled 100kohm and 100ohm respectively. but inside of both bags sitting 100ohms resitors. didint understand how this could happen.


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Old 29th April 2006, 02:40 PM   #49
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This happens.
When I order resistors or any other part, I always check. Resistors with a DMM, the labels on the caps and transistors. If they match they go in the correct box. I never blindly stock them.

As for your source resistors, if they burn, most likely the mosfet is short circuit. As BobEllis said, make sure they are well mounted and perfectly isolated from the heat sink.

/Hugo
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Old 29th April 2006, 04:00 PM   #50
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before powering I check all drains to heatsinks is there any short circuit.. seems no but the second pcb smoked minus side completely mosfets and 0,39 resitors. that is OK for today..
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