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Old 27th January 2010, 01:33 PM   #1
johnr66 is offline johnr66  United States
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Default Glue!

I'm building a small amplifier (using TDA1517) and I want to glue in the board into the case once it is tested to eliminate drilling and extra hardware costs.

I will also glue the heatsink to the board and case for mechanical stability and heat transfer.

Should I use epoxy or hot melt or ???

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Old 27th January 2010, 01:44 PM   #2
Glowbug is offline Glowbug  United States
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You have no extra screws laying around?

One thing with epoxying the PCB into the case; if you ever want to change something, removing it will be more of a pain than if it's just held in place with screws and standoffs.
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Old 27th January 2010, 02:09 PM   #3
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I certainly wouldn't hot melt the heatsink in place!
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Old 27th January 2010, 02:20 PM   #4
Magura is offline Magura  Denmark
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Quote:
Originally Posted by tsmith1315 View Post
I certainly wouldn't hot melt the heatsink in place!
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Old 27th January 2010, 02:31 PM   #5
Mr Teal is offline Mr Teal  Canada
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I've used Dow Corning SE 4450 as a thermal adhesive, but thermal performance will still be worse than a decent conventional thermal paste, and it will be more expensive to boot. If you're looking to avoid drilling to keep the case pretty, you could epoxy some standoffs on the case, and then you have can still remove the board without destroying it.
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Old 27th January 2010, 02:47 PM   #6
johnr66 is offline johnr66  United States
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LOL! Yes, hotmelting the heatsink isn't a smart idea. Of course, I over heatsink everything and it never gets too warm. I have been making battery chip amps since the eighties and with good layout, I have never had to go back in. I just want to lay down some glue and squish the board right into it to keep it secure. IC tab will be screwed to a copper "U" shaped heatsink that is epoxied to the board. No more drilling holes except for the connectors!
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Old 30th January 2010, 02:20 PM   #7
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Clear silicone is what you want:

Click the image to open in full size.

Strong but slightly flexible, long lasting. Easier to apply than epoxy.
Make sure it is "silicone" you are buying - many people thing that anything in a tube is silicone.
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Old 5th May 2010, 11:16 PM   #8
woolly is offline woolly  United Kingdom
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Looking to glue chipamp to heatsink.
Dow Corning sounds good. Hope i can find it in a high street store
If not, is any 2part epoxy glue 80% as good ?
Silicon? is that not too thick, leaving a big gap
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Old 5th May 2010, 11:36 PM   #9
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I've hot glued circuit boards into wooden boxes with no trouble. If you need to get it out, heat it with a heat gun. I don't like silicone because it's so hard to get apart. Can the heatsink be located with wood rails and a wedge of some sort? Then hot glue the wedge where it doesn't get hot.
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Old 11th May 2010, 03:24 AM   #10
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Silicone would not be for using between the chip and the heatsink - would be for gluing circuit board into cabinet, etc.

Use heatsink compound between the chip + sink, and you could use silicone to hold it in place still. Just around the chip, not directly between chip and sink...

If you want to be able to remove the board you could just use blobs of silicone at the corners - as Conrad says, you could make it very hard to remove the board (if you use lots of glue).
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