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Old 5th December 2006, 07:05 PM   #21
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I have used "binder clips" for light duty clamping,the wings are easily removed after fitting although are limited to heat sink style

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Old 5th December 2006, 07:14 PM   #22
CarlosT is offline CarlosT  United States
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Very cool...

Are you talking about the black spring binder clips with flipout chromed wire handles? The width is perfect for the extrusion I got but...

My problem is that my heatsink is too tall and the clip doesn't reach for down enough...the No. 50 clip goes down about 5/8"...BUMMER.

Great idea though and the price is right
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Old 10th December 2006, 01:21 PM   #23
CarlosT is offline CarlosT  United States
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So I got some samples of the CLP212 from Aavid and they sure are cute...but they won't work...too short. I'm now waiting for some samples from Fischer.

The problem is that the heatsink is 1.5" tall and the LM3875 is only .7" tall from solder joint to mounting eye and you need to provide a little clearance between the pcb and the heatsink. This all conspires to make the CLP212 too short to reach the spot where the LM3875 lies. The clip really needs to be about 1" or the heatsink needs to be a little shorter.
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Old 10th December 2006, 07:23 PM   #24
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It might just be easier to drill a hole for a screw...
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Old 10th December 2006, 10:48 PM   #25
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I made these with a mill -- you can do the same thing with a rat-rail file -- the back should be slightly "bowed" so that pressure is applied evenly across the chip:

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Old 10th December 2006, 11:24 PM   #26
v-bro is offline v-bro  Netherlands
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Very good solution! The chip gets cooled at the front too, I did almost the same thing with a TDA2030 chip amp years ago. Worked like a charm, pitty the amp drowned in my car (almost including me...)...
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Old 10th December 2006, 11:58 PM   #27
CarlosT is offline CarlosT  United States
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Very cool!

On a TO-220 package the amount of pressure that can be put on the plastic package portion is much less than what can be put on the mounting tab...still all like you'd need a Lilliputian torque wrench. How many actually use a torque wrench?

The limit is 150n/sq. mm of pressure for the LM4780.
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Old 10th December 2006, 11:59 PM   #28
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Quote:
Originally posted by v-bro
Very good solution! The chip gets cooled at the front too, I did almost the same thing with a TDA2030 chip amp years ago. Worked like a charm, pitty the amp drowned in my car (almost including me...)...
Exactly, lest we forget: chips emit heat down their little legs, and through those parts which don't get the silicone goo spread all over them.
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Old 13th December 2006, 11:57 PM   #29
v-bro is offline v-bro  Netherlands
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Quote:
Originally posted by jackinnj
[B...and through those parts which don't get the silicone goo spread all over them. [/B]

Hey, you can overdo it , isn't that stuff poisonous by the way?

I recently built an AMP9 from 41hz, thanx to you guys I started to think a bit differently about placing a heatsink. To test it I'm using an L-shaped pice of aluminum clipped to the chip by two very powerful clips.. (and offcourse a piece of silicone cloth between them..)
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Old 14th December 2006, 03:21 PM   #30
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Quote:
Originally posted by v-bro



Hey, you can overdo it , isn't that stuff poisonous by the way?

My advise is to keep your tongue off the heatsink.

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