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Old 7th February 2009, 10:05 PM   #2761
Diomedian is offline Diomedian  Canada
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Quote:
Originally posted by samsagaz
what about BER131-ND? are cheap
BER131-ND are made of "Q-Pad 3" material, which is electrically conductive. This may be fine in some cases though - it certainly has good thermal ratings.

-j
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Old 7th February 2009, 11:51 PM   #2762
ichiban is offline ichiban  United States
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Quote:
Originally posted by Diomedian

quote:
Originally posted by samsagaz
what about BER131-ND? are cheap

BER131-ND are made of "Q-Pad 3" material, which is electrically conductive. This may be fine in some cases though - it certainly has good thermal ratings.

-j
These seem to be similar for only $US 0.25 each

Mouser Part #: 567-175-6-230P
Manufacturer Part #: 175-6-230P
Manufacturer: Wakefield
Description: Heatsink Accessories TO-220 .006" KAPTON
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Old 8th February 2009, 12:23 AM   #2763
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally posted by ichiban


These seem to be similar for only $US 0.25 each

Mouser Part #: 567-175-6-230P
Manufacturer Part #: 175-6-230P
Manufacturer: Wakefield
Description: Heatsink Accessories TO-220 .006" KAPTON
to-220
too small, except for to-220 devices.

I am still looking for the ultimate mica to-3p to-247 insulator part # myself.
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Old 8th February 2009, 12:31 AM   #2764
woodturner-fran is offline woodturner-fran  Ireland
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Plus they're TO220 - you would need something a little bigger I think for Q3/4.


Mouser do have this one:

link


I think its the same size. TO247 is meant to be 16mm x 21mm (0.625"x0.875") and this pad is apparently 0.6" x 1".

I'm not sure if the holes will all line up correctly. I'll be placing an order with mouser and might buy a few just to see. Probably worth it at only 0.06c each.

Could someone have a look at this and confirm what I'm seeing?

Fran
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Old 8th February 2009, 07:55 AM   #2765
enzedone is offline enzedone  New Zealand
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Default Thermal pads

Fran

I bought a 400x400 sheet a couple of years back and have been sitting on it. Give me your sizes and i'll cut some up for ya. And send it over.

Way to go, for sorting the amp out...........

Brett
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Old 8th February 2009, 11:34 AM   #2766
woodturner-fran is offline woodturner-fran  Ireland
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Wow, thanks Brett.


Look, I'll probably buy some of those ones from Mouser. At least then we'll know if they work ok. I'll PM you my addess but look I don't want to put you out....


Fran
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Old 8th February 2009, 03:07 PM   #2767
Nelson Pass is offline Nelson Pass  United States
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Quote:
Originally posted by Tea-Bag
I am still looking for the ultimate mica to-3p to-247 insulator part # myself.
I use the ones made by Keystone.


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Old 8th February 2009, 05:39 PM   #2768
labjr is offline labjr  United States
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I'm searching for an enclosure and heatsinks. Does anyone know if the enclosure has to be all metal for shielding from noise and feedback etc. ?

I'm considering using a partially wooden enclusure.
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Old 8th February 2009, 06:00 PM   #2769
Phil Townsend is offline Phil Townsend  United States
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Default Tell me why...

Nelson, why do you like the Mica insulators over the various other types...

Enquiring Minds and all that stuff.
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Old 8th February 2009, 06:01 PM   #2770
AndrewT is offline AndrewT  Scotland
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to protect against electric noise/interference you must (completely) surround the circuit with a conductive cage/box. It does not have to be metal.
Wood is a fairly good insulator, so can't give any help.

To protect against magnetic fields you need something quite different. I don't know enough to give advice.
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