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Old 10th March 2012, 07:54 PM   #1
timwebb is offline timwebb  United States
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Default US Amps md 3d

anyone have a schematic for this amp.
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Old 10th March 2012, 08:45 PM   #2
DREW028 is offline DREW028  United States
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I called re audio for one and they said there information proprietary.



I just got my parts in and will start working on it after I finish these other 2 amps. All power FETs shorted along with 3 outputs and 2 caps next to the inductor.
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Old 10th March 2012, 09:30 PM   #3
timwebb is offline timwebb  United States
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all the caps in the power supply are vented the power supply transistors were shorted and out put transistors. when i powerd the amp up a few of the output transistors get very hot,but there are no output transistors in the amp
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Old 11th March 2012, 02:31 PM   #4
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Quote:
Originally Posted by timwebb View Post
all the caps in the power supply are vented the power supply transistors were shorted and out put transistors. when i powerd the amp up a few of the output transistors get very hot,but there are no output transistors in the amp
How do the parts get hot when they are not populated, please explain?
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Old 11th March 2012, 03:34 PM   #5
timwebb is offline timwebb  United States
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when i power up the amp. it slowly pulls current like there is a shorted output transistor. but there are none in the amp. i found there is not a clean wave on the tabs of the transistors in the power supply. im thinking now could it be the caps in the power supply? i pulled the ones that were vented. im sure the rest is bad also. i have new ones coming so ill have to wait.
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Old 11th March 2012, 10:33 PM   #6
timwebb is offline timwebb  United States
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i found one issue the guy that repaired it be for me used 10 ohm resistors as gate resistors in the power supply with dfp70n06 fets.
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Old 11th March 2012, 11:15 PM   #7
DREW028 is offline DREW028  United States
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The fets I took out of mine were irf1010n

Arrow had them cheap at about $.66
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Old 11th March 2012, 11:37 PM   #8
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if the power supply caps are pulling current, wouldn't that be all the time, not just when powered on? I would pull the rectifiers And test them, the rail caps, and rest of the output side for shorting. With the rectifoers out, you will be able to run the power supply section solo, and test/ensure stability. If there is a problem there, it is much easier to track down.
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Old 27th March 2012, 03:53 PM   #9
timwebb is offline timwebb  United States
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im finishing this amp up and all the fets are mounted under the board.is there any kind of thermal padding to put between the fet and the circuit board?
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Old 27th March 2012, 09:19 PM   #10
DREW028 is offline DREW028  United States
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Must be a different version than mine. I just repaired and autotek stealth and the fets were mounted under the board. I cant say for sure on your but on the autotek their was only the pad between the fets and the heatsink.
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