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Old 8th February 2009, 06:09 PM   #2771
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally posted by Nelson Pass


I use the ones made by Keystone.


I'm not to sure exactly which one's. Spec sheet looks to fit quite tight, with little wiggle room on the sides. I could be overlooking an obvious one.

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Old 8th February 2009, 06:16 PM   #2772
sekess is offline sekess  United States
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Default mica

Hey Tea-Bag,

I'm not 100% sure, but it looks like Keystone's 4661 would do it. It's made for a TO-3 package. But, I think the TO-247 will fit. You will have to cut is some though.

Steve
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Old 8th February 2009, 06:23 PM   #2773
max426 is offline max426  United States
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Default mica

I ordered 4671, looked like a good fit to me.
I am very much a rookie at this. When all my parts arrive i'm sure i will have plenty of questions for everyone.

jim
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Old 8th February 2009, 06:28 PM   #2774
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Default Re: mica

Quote:
Originally posted by sekess
Hey Tea-Bag,

I'm not 100% sure, but it looks like Keystone's 4661 would do it. It's made for a TO-3 package. But, I think the TO-247 will fit. You will have to cut is some though.

Steve

I have some of those, and the Berq band-aid looking pads.
The 4661 has a hole where the FET where some goop may get through, not sure if it may make contact with the sink and short.



The Mica's I've used on To-220 projects I like working with better than the silicon pads. I think having goop keeps the pad from moving around.
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Old 8th February 2009, 06:31 PM   #2775
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Keystone 4663 is the one you're looking for I think. It'll fit to-247 packages. Digikey seems to be out of stock, but at Mouser it's part number 534-4663.

-j
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Old 8th February 2009, 06:48 PM   #2776
labjr is offline labjr  United States
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Quote:
Originally posted by AndrewT
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.
I realize that a traditional metal amplifier looks cool.

However, I'm trying to save a ton of metal work. Maybe make a nice cube-shaped walnut wood box with heatsinks on the sides. I just don't want to get it all together and have an oscillation problem.
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Old 8th February 2009, 07:00 PM   #2777
JimT is offline JimT  Canada
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I have the Keystone 4661's and put a IRFP240 on it to check. The two small holes in the mica are low enough down that they are under the plastic part of the case just at its lower edge. The holes should not be an electrical problem.

Jim
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Old 8th February 2009, 07:02 PM   #2778
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ok, so it seems that with keystone 4661 or 4663 will both work ok.


Good work guys!

Fran
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Old 8th February 2009, 09:39 PM   #2779
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labjr
why not to stick aluminium paper on the inside of your wooden box?
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Old 8th February 2009, 11:08 PM   #2780
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Yes, aluminum foil and spray adhesive, or there is peel 'n stick copper sheeting sold as flashing. It is available from your building materials supplier.
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