samsagaz said: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
Diomedian said:
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
ichiban said:
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.
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
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
Tea-Bag said:I am still looking for the ultimate mica to-3p to-247 insulator part # myself.
I use the ones made by Keystone.
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.
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.
Nelson Pass said:
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.
Re: mica
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.
sekess said: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.
AndrewT said: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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