diyAudio (
-   Construction Tips (
-   -   Glue! (

johnr66 27th January 2010 02:33 PM

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 ???


Glowbug 27th January 2010 02:44 PM

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.

tsmith1315 27th January 2010 03:09 PM

I certainly wouldn't hot melt the heatsink in place!

Magura 27th January 2010 03:20 PM


Originally Posted by tsmith1315 (
I certainly wouldn't hot melt the heatsink in place!

Chicken! :rofl:

Magura :)

Mr Teal 27th January 2010 03:31 PM

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.

johnr66 27th January 2010 03:47 PM

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!

MJL21193 30th January 2010 03:20 PM

Clear silicone is what you want:

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.

woolly 6th May 2010 12:16 AM

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

Conrad Hoffman 6th May 2010 12:36 AM

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.

critofur 11th May 2010 04:24 AM

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).

All times are GMT. The time now is 07:11 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 18.75%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio