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Old 20th November 2005, 11:37 PM   #1
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Default 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..

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Old 21st November 2005, 05:16 AM   #2
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Default Re: Insulation on LM3875's

No, you don't need the insulators.
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Old 21st November 2005, 06:05 AM   #3
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Thumbs up Sweet As

Cheers... I didn't think so but it's better to check
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Old 21st November 2005, 12:42 PM   #4
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No, but be aware that you make it much more likely to cause an accidental short!
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Old 21st November 2005, 12:59 PM   #5
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... and it may form an antenna but if the whole thing is located in a good (metal) box I think it's perfectly alright.
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Old 22nd November 2005, 03:22 AM   #6
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Default 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.

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Old 22nd November 2005, 04:18 AM   #7
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Why not get the insulated version of the chips... might be a cheaper mod.
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Old 22nd November 2005, 05:37 AM   #8
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Thumbs down 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.....
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Old 22nd November 2005, 06:28 AM   #9
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LOL, try living in Africa...

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Old 22nd November 2005, 08:10 AM   #10
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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).
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