What to use for TO-220 isolating pad? - Page 2 - diyAudio
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Old 11th July 2003, 03:23 PM   #11
MWP is offline MWP  Australia
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You can use common TO3 insulators by cutting them in half.
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Old 11th July 2003, 05:43 PM   #12
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Quote:
Originally posted by Netlist
There are silpads available in larger formats (100x100mm) which you can cut into the desired format.
does anyone know where I may be able to get those sheets in the US?

Thanks.
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Old 11th July 2003, 06:05 PM   #13
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silpad is very expensive.....I purchased a 12" wide roll for a production run and it was a 1000CAN.....we used a paper cutter to cut the required size which increased labour costs....I regret approving the decision now


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Old 11th July 2003, 07:04 PM   #14
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Quote:
Originally posted by millwood


does anyone know where I may be able to get those sheets in the US?

Thanks.

Maybe Digikey... ...I order sillpads from there... ...but not sheets.
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Old 14th July 2003, 04:13 PM   #15
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Quote:
Originally posted by Peter Daniel
Plastc screw is OK when not much pressure is required (diodes), but on ICs and transistors, I'm using metal screw (non magnetic) and a plastic washer (I buy from Supremetronic).

Are those plastic washer are just normal flat ones, I am concern about the shaft of the screw may make contact with the inside surface of the heat sink thru hole. May be I have to use heat shrink on the screw first?
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Old 14th July 2003, 04:14 PM   #16
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Those are washers designed for that purpose. They have additional lip, that prevents the screw from touching the case.
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Old 14th July 2003, 04:19 PM   #17
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Quote:
Originally posted by chris ma
I am concern about the shaft of the screw may make contact with the inside surface of the heat sink thru hole.
Chris, like Peter said, those washers have extra-long "sleeves" that do precisely that: preventing the screw from touching the heatsink.

I have been using plastic tubing for that purpose as well.
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Old 15th July 2003, 01:14 AM   #18
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Since TO-220s normally run around 1W dissipation or thereabouts, I normally just use a simple bolt on heatsink like a THD6080 and don't even bother with insulation. This improves thermal coupling, and since the heatsink is small anyway you can usually tolerate it being at collector potential.

Cheers,

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Old 15th July 2003, 05:57 AM   #19
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The rest of a thread is here: http://www.diyaudio.com/forums/showt...608#post204608
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