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Old 14th November 2009, 07:21 PM   #901
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Ah...then I have a completely different idea...are your chips the insulated type or naked? National make both. If naked it is possible that you need to insulate them.
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Old 14th November 2009, 07:24 PM   #902
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Ah...then I have a completely different idea...are your chips the insulated type or naked? National make both. If naked it is possible that you need to insulate them.
Its the LM 3875 TF all black and i think its insulated type.
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Old 14th November 2009, 09:12 PM   #903
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here are two pics one of the guts and one of the housing if they help


Nick
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File Type: jpg PA312414.jpg (648.4 KB, 484 views)
File Type: jpg PB142427.jpg (650.6 KB, 474 views)
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Old 15th November 2009, 07:59 AM   #904
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since its Sunday i cannot get caps as peter suggested but i tried to turn off all apliances that might produced interference. Wifi, wilress phones etc.
Nothing changed.
i connected a source and when the music started this loud audible mors code stoped. The music was more cleared when i turned the pot to louder. There were some static in the music thous but the noise did not exist. It appeared again in the time between the songs or when a song had a pause.

I have also connected a filer in the input of the psu to be on the safe side.
Any ideas?

Last edited by tiglitosa; 15th November 2009 at 08:02 AM.
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Old 15th November 2009, 10:27 AM   #905
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Ok that was it !!!

its idiotic !! I should have notice that earlier. The speaker had burned its crossover and thus produced this sound !!!! it was a small wooden 2 way jcv 6ohm 40w speaker that could not handle the power. I tried it with a bookself 80w 8 ohms crystal audio and voila!!!

Though some clipping occurs but i think with bigger speaker i will not have any problems.

soon some finished pics !!

thank you

Nick
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Old 15th November 2009, 12:51 PM   #906
AndrewT is offline AndrewT  Scotland
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could the damaged speaker have been overloading the chipamp and the protection systems were intermittantly switching the chipamp to some safe mode?

How is the TF chip mounted to the heatsink?
Where does that cable go?
Is the TF thermally coupled to the heatsink or is it mounted dry?

How does the heat get out of the TF?
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Old 15th November 2009, 12:57 PM   #907
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Quote:
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could the damaged speaker have been overloading the chipamp and the protection systems were intermittantly switching the chipamp to some safe mode?
Perhaps i dont really know !

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How is the TF chip mounted to the heatsink?
It is mounted through a bolt. Actually the bottom of the amp is the heatsink (2cm thick aluminum plate).

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Where does that cable go?
its going to the chassis ground on the amp board

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Is the TF thermally coupled to the heatsink or is it mounted dry?
I use Zalman thermal greace used for computer chips.

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How does the heat get out of the TF?
the Aluminum board stays pretty cool if thats what you mean. The tf is attached to the heatsink throug a copper leaf.

Nick
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Old 15th November 2009, 01:29 PM   #908
AndrewT is offline AndrewT  Scotland
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your answers do not look like the pic (superb quality and focus).
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Old 15th November 2009, 02:07 PM   #909
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your answers do not look like the pic (superb quality and focus).
Sorry i lost you Why my answers does not look like the pic? in which case?

thank you

Nick
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Old 15th November 2009, 02:24 PM   #910
AndrewT is offline AndrewT  Scotland
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what is between the chassis base plate and the TF mounting face?
What you listed is not what I can see in the pic.
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