big mosfet wire mixup...

aptquark · 7th June 2010, 12:48 PM

Being the incredibly adept retard that I am, I mistakenly mixed up the wiring that goes to one of the two mig mosfets in my Gamut D200 mrkII amp. There are 3 wires going to it...a blue, red and brown (which has a resistor or something connected inline). I accidentally (retard comes in at this point) reversed the red and brown. Could I have damaged the mosfet? The amp had a relay burned out on the CB, which I just replaced. When I powered it up...with no source input...that side of the amp had a 1V output. The other side was 0v. After connecting source and speakers...no sound was heard. Turned everything off. THEN realized mistake. I fixed the mixup...and now the amp immediately blows a fuse when turned on. I checked the transistors on the CB (mje340 and 350's) when I was troubleshooting the initial relay problem and they showed normal response. Any ideas. I

Nrik · 7th June 2010, 01:11 PM

Your MOSFET is probably gone.
To verify disconnect it and measure ohms between drain and source in both directions (where the blue and red goes). If the ohms are close to 0 ohms it is dead.

nigelwright7557 · 7th June 2010, 01:25 PM

Its possible the complimentary MOSFET has gone as well.
Check it before replacing the other one.

aptquark · 7th June 2010, 02:39 PM

Any idea where I could buy these?? I'm looking but no luck. Assuming of course if they are blown.

aptquark · 7th June 2010, 02:40 PM

BUZ900X4S160V32A500WSOT227BUZ900X4S

sdman · 7th June 2010, 07:38 PM

Is this the markings on the transistors? BUZ900X4S160V32A500WSOT227BUZ900X4S

I believe it is an SOT227 case.

Sam

Nrik · 7th June 2010, 07:50 PM

Yes - Gamut uses SOT227 MOSFETs
Read the text on the Mosfet, then google.
Otherwise Digikey have some Ixys that might do the trick.

aptquark · 7th June 2010, 09:34 PM

thanks guys...I will check and post soon...

sdman · 8th June 2010, 12:50 PM

Does the big mosfet have any part numbers on it?

sam

sdman · 30th June 2010, 01:51 PM

Say, aptquark did you ever get the Gamut D200 fixed and did you find the
large sot227 mosfets for the outputs?
I've got a friend with the same problem with his D200 and he doesn't have the coins to send it to the factory for repair.
I'll try to help him repair it if we can get some more info on the amp.

thanks,

Sam

7th June 2010, 12:48 PM	#1
aptquark diyAudio Member Join Date: Jun 2010 Location: MS Blog Entries: 1	big mosfet wire mixup... Being the incredibly adept retard that I am, I mistakenly mixed up the wiring that goes to one of the two mig mosfets in my Gamut D200 mrkII amp. There are 3 wires going to it...a blue, red and brown (which has a resistor or something connected inline). I accidentally (retard comes in at this point) reversed the red and brown. Could I have damaged the mosfet? The amp had a relay burned out on the CB, which I just replaced. When I powered it up...with no source input...that side of the amp had a 1V output. The other side was 0v. After connecting source and speakers...no sound was heard. Turned everything off. THEN realized mistake. I fixed the mixup...and now the amp immediately blows a fuse when turned on. I checked the transistors on the CB (mje340 and 350's) when I was troubleshooting the initial relay problem and they showed normal response. Any ideas. I

7th June 2010, 01:11 PM	#2
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	Your MOSFET is probably gone. To verify disconnect it and measure ohms between drain and source in both directions (where the blue and red goes). If the ohms are close to 0 ohms it is dead. __________________ STOP - Hammertime!

7th June 2010, 01:25 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Its possible the complimentary MOSFET has gone as well. Check it before replacing the other one. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

7th June 2010, 07:38 PM	#6
sdman diyAudio Member Join Date: Oct 2001 Location: Southwest	Buz900x4s160v32a500wsot227buz900x4s Is this the markings on the transistors? BUZ900X4S160V32A500WSOT227BUZ900X4S I believe it is an SOT227 case. Sam __________________ Sam

7th June 2010, 07:50 PM	#7
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	Yes - Gamut uses SOT227 MOSFETs Read the text on the Mosfet, then google. Otherwise Digikey have some Ixys that might do the trick. __________________ STOP - Hammertime!


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7th June 2010, 02:39 PM	#4
aptquark diyAudio Member Join Date: Jun 2010 Location: MS Blog Entries: 1	Any idea where I could buy these?? I'm looking but no luck. Assuming of course if they are blown.

7th June 2010, 02:40 PM	#5
aptquark diyAudio Member Join Date: Jun 2010 Location: MS Blog Entries: 1	BUZ900X4S160V32A500WSOT227BUZ900X4S

7th June 2010, 09:34 PM	#8
aptquark diyAudio Member Join Date: Jun 2010 Location: MS Blog Entries: 1	thanks guys...I will check and post soon...

8th June 2010, 12:50 PM	#9
sdman diyAudio Member Join Date: Oct 2001 Location: Southwest	Big mosfet Does the big mosfet have any part numbers on it? sam __________________ Sam

30th June 2010, 01:51 PM	#10
sdman diyAudio Member Join Date: Oct 2001 Location: Southwest	Say, aptquark did you ever get the Gamut D200 fixed and did you find the large sot227 mosfets for the outputs? I've got a friend with the same problem with his D200 and he doesn't have the coins to send it to the factory for repair. I'll try to help him repair it if we can get some more info on the amp. thanks, Sam __________________ Sam

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