Insulation on LM3875's

enzedone · 20th November 2005, 11:37 PM

Is there a need to insulate these chips on the heatsinks if the heatsinks themselves will never come into contact with any other object that might conduct? I am using the T series..... Buying an insulation sheet just for two little chips is rather expensive..

sofaspud · 21st November 2005, 05:16 AM

No, you don't need the insulators.

enzedone · 21st November 2005, 06:05 AM

Cheers... I didn't think so but it's better to check

Nuuk · 21st November 2005, 12:42 PM

No, but be aware that you make it much more likely to cause an accidental short!

peranders · 21st November 2005, 12:59 PM

... and it may form an antenna but if the whole thing is located in a good (metal) box I think it's perfectly alright.

enzedone · 22nd November 2005, 03:22 AM

O.k so it looks as though I'm just going to have to bite the bullet and buy an entire insulation sheet as my cabinets are not made from metal.....$50.00 for a 300ml x 30oml sheet, it doesn't come cheap. Boy so mush for trying to keep the cost down buy only buying the boards from Peter as opposed to the hole kit.

Nordic · 22nd November 2005, 04:18 AM

Why not get the insulated version of the chips... might be a cheaper mod.

enzedone · 22nd November 2005, 05:37 AM

No thats a no go i'm affraid. I can only get the 'T' series here. I would have bought them if i could have, much easier to deal with. Thats the problem with living in a small country. Small market, bad service.....

Nordic · 22nd November 2005, 06:28 AM

LOL, try living in Africa...

For National's distributors in NZ click here

Nuuk · 22nd November 2005, 08:10 AM

Quote:

O.k so it looks as though I'm just going to have to bite the bullet and buy an entire insulation sheet as my cabinets are not made from metal.....$50.00 for a 300ml x 30oml sheet, it doesn't come cheap. Boy so mush for trying to keep the cost down buy only buying the boards from Peter as opposed to the hole kit.

I don't know who your supplier is, but I would have thought that if they sell the full sheets of insulation, they would also do the 'standard' pads. It's the TO-220 type that you should ask for (about 11p each here in the UK).

20th November 2005, 11:37 PM	#1
enzedone diyAudio Member Join Date: Nov 2004 Location: New Zealand	Insulation on LM3875's Is there a need to insulate these chips on the heatsinks if the heatsinks themselves will never come into contact with any other object that might conduct? I am using the T series..... Buying an insulation sheet just for two little chips is rather expensive.. __________________ I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX.

21st November 2005, 05:16 AM	#2
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	Re: Insulation on LM3875's No, you don't need the insulators.

21st November 2005, 06:05 AM	#3
enzedone diyAudio Member Join Date: Nov 2004 Location: New Zealand	Sweet As Cheers... I didn't think so but it's better to check __________________ I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX.

21st November 2005, 12:42 PM	#4
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	No, but be aware that you make it much more likely to cause an accidental short! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

21st November 2005, 12:59 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	... and it may form an antenna but if the whole thing is located in a good (metal) box I think it's perfectly alright. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread


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22nd November 2005, 03:22 AM	#6
enzedone diyAudio Member Join Date: Nov 2004 Location: New Zealand	Hmmmmmmm O.k so it looks as though I'm just going to have to bite the bullet and buy an entire insulation sheet as my cabinets are not made from metal.....$50.00 for a 300ml x 30oml sheet, it doesn't come cheap. Boy so mush for trying to keep the cost down buy only buying the boards from Peter as opposed to the hole kit. __________________ I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX.

22nd November 2005, 04:18 AM	#7
Nordic diyAudio Member Join Date: Sep 2005	Why not get the insulated version of the chips... might be a cheaper mod.

22nd November 2005, 05:37 AM	#8
enzedone diyAudio Member Join Date: Nov 2004 Location: New Zealand	Not possible No thats a no go i'm affraid. I can only get the 'T' series here. I would have bought them if i could have, much easier to deal with. Thats the problem with living in a small country. Small market, bad service..... __________________ I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX.

22nd November 2005, 06:28 AM	#9
Nordic diyAudio Member Join Date: Sep 2005	LOL, try living in Africa... For National's distributors in NZ click here

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