10 pieces aleph x and non of theese working - Page 5

Netlist · 29th April 2006, 01:08 PM

Nice find. That probably explains why all of the amps don't work.
Now clean that kitchen table.

/Hugo

elviukai · 29th April 2006, 01:12 PM

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

Netlist · 29th April 2006, 01:23 PM

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

BobEllis · 29th April 2006, 01:34 PM

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.

rtirion · 29th April 2006, 01:35 PM

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

Netlist · 29th April 2006, 01:43 PM

Quote:

Originally posted by rtirion
No offence, but I am out.

That must be a mistake.

/Hugo

elviukai · 29th April 2006, 02:19 PM

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..

elviukai · 29th April 2006, 02:26 PM

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.

Netlist · 29th April 2006, 02:40 PM

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

elviukai · 29th April 2006, 04:00 PM

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..

29th April 2006, 01:12 PM	#42
elviukai diyAudio Member Join Date: Apr 2003 Location: EU- Electronic Union country	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 __________________ natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..

29th April 2006, 02:19 PM	#47
elviukai diyAudio Member Join Date: Apr 2003 Location: EU- Electronic Union country	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.. __________________ natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..

29th April 2006, 04:00 PM	#50
elviukai diyAudio Member Join Date: Apr 2003 Location: EU- Electronic Union country	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.. __________________ natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..

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29th April 2006, 01:08 PM	#41
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Nice find. That probably explains why all of the amps don't work. Now clean that kitchen table. /Hugo

29th April 2006, 01:23 PM	#43
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	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

29th April 2006, 01:34 PM	#44
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	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.

29th April 2006, 02:40 PM	#49
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	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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