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Old 23rd November 2009, 04:40 PM   #1
jaffeth is offline jaffeth  Malaysia
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Unhappy Dc 25v at pin 3 lm3886 (help)

dc 25v on spk out LM3886
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Old 23rd November 2009, 09:59 PM   #2
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Quote:
Originally Posted by jaffeth View Post
dc 25v on spk out LM3886
Are you getting 25vdc on the speaker output? if is that....Something is REALLY wrong.Do not connect any speakers ( you will fry speakers).can you post schematic.Did you follow instructions correctly?. Go over the entire amp again, This time take it slowly.
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Old 23rd November 2009, 10:07 PM   #3
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How do you connect the ground? Is it a P2P wiring or PCB mount?
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Old 24th November 2009, 07:48 AM   #4
Dxvideo is offline Dxvideo  Turkey
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May be your 3886's inverted input is floating from a bad solder joint or somthing else. So I would check the solderings first..
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Old 24th November 2009, 02:49 PM   #5
jaffeth is offline jaffeth  Malaysia
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my first project lm3886 is success,the second project having a problem

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(Mick Feuerbacher 2007)
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Old 25th November 2009, 01:18 AM   #6
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With the voltmeter, is there the same amount of voltage inside the power caps?
If it is different, that can get to the output.
This can also happen if one rail isn't hooked up.
It can also happen if the chip is bad or worn out.
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Old 25th November 2009, 02:37 PM   #7
jaffeth is offline jaffeth  Malaysia
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100_2251.jpg

CASch.jpg

100_2271.jpg

My first project LM3886,Successful and very good sound.(view the schematic)
for my second project,getting 25v dc volt at pin 3.supply cap voltage at output.i ready replace the new lm3886 chip,but getting the same result.i will check again all the connection,maybe i am wrong.izit good to use the crocodile clip for supply (+V & -V)connections and GND connection for testing?correct me frm wrong.Thanks...........JESUS MY SAVIOR
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