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Old 16th January 2008, 06:23 PM   #561
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Default Re: Question about 2sc5200/2sa1943

Quote:
Originally posted by salesmonster
Newbie question:
Do the heatsinks for each channel need to be electrically isolated from each other? Or can 2 boards share one long heatsink?
Dave
Each transistor needs to be electrically isolated from the heatsink - that's the job of the pads. If well isolated it is not a problem to put one or more channels on a heatsink, because the heatsink is at chassis ground.

But since heat must be conducted away from the transistor you also need low thermal resistance - that the reason for using thermal compounds. Sanding and polishing the contact surfaces is recommended by some -- helps lower the thermal resistance. Thermal compounds are not insulating and must be used in a very thin film, it only fills microscopic uneveness in the mating surfaces.

Before using arctic silver as thermal compound check its properties - I think it is electrically conductive. You don't want to use a conductive material here.

Hope this helps,
Francois
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Old 16th January 2008, 07:20 PM   #562
Nordic is offline Nordic  South Africa
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Artic silver is fine with those pads.. have combined them before...

Arcticsilver is not conductive to the point that I'd worry about it... it can act capacitive (bit of a problem if you decide to use them on some videocards' memory chips), but I have used it with great success.. take multimeter and find which pin is connected to the transistor's tab... after installing transistorcheck for no continuity between the tab and the sink...

P.S. prefer Mica pads and thermal goop above the silicon ones..
burs on the drill edge of holes can for instance cut through the silicon and cause a short...
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Old 16th January 2008, 10:12 PM   #563
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Default Thanks!

Thanks for the information. I'm much clearer now.

Play safe!
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Old 23rd January 2008, 01:08 PM   #564
Nordic is offline Nordic  South Africa
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Thanks mr boss people!!!

Now how about some feedback..? you guys are either the slowest or most polite builders...
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Old 23rd January 2008, 01:15 PM   #565
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Het u dan wel eens last gekry met die pos ?
Mail from SA to old boer country is slowest.
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Old 23rd January 2008, 01:35 PM   #566
Nordic is offline Nordic  South Africa
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Het jy nie jou goed gekry nie?
Will look up tracking later when I'm on my regular harddrive.... just swap to this one for work stuff.
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Old 23rd January 2008, 01:48 PM   #567
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Hi Nordic,

I have emailed you directly.


I am busy collecting bits and pieces for the construction of this amplifier, has there been any discussion on suitable enclosures for it? What size enclosure should I be looking at?


-Eric
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Old 23rd January 2008, 02:14 PM   #568
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Bare knuckle enclosure fight.

All-in-One 7-incher, 1/2" heavyweight=>
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Old 23rd January 2008, 05:29 PM   #569
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Default Nico, can you please upload to my mail adress the gerber files and whole

stuff needed to order boards.

I have friends in brazil that want me to provide them HRII and Precision 1 amplifiers, so, i have to order boards in my country.

Because of that i am asking you those files as soon as possible.

panzertoo@yahoo.com

regards,

Carlos
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Old 23rd January 2008, 05:36 PM   #570
cwujek is offline cwujek  United States
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If anyone wants to get a HDII kit, I'm selling two stereo sets in the trading post. I just don't have the time....
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