Steve "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
Do a quick Google search for Conformal Coating and you'll have what you need. Conformal Coatings come in spray form mostly·and do a good job of sealing circuit boards against elements like humidity. Makes them a bit of a bugger to work on after the fact, but provides protection.
Silicone resin is the easiest to repair. It comes in brush-on or spray, but due to restrictions on volatile solvents (tolual and MEK), it is getting harder to order.
The epoxy I like is DP270 from 3M, electronic encapsulation epoxy. It has a long pot life and very low viscosity to flow into voids, good thermal and mechanical properties, and does not chemically attack components.
plastic bags, for the one that mentioned it, aren't a good option. The Pinholes in thin plastic are many and in this case even aluminium would be better. Pharmaceutical primary packaging materials are very good for waterproofing.
I was thinking of something like the hard black plastic resin that is poured into a small open· top enclosure with just the hook up wires sticking out. I want it to be perminent.
If really permanent is desired. . .
3M's epoxy is by far the easiest to get ahold of.
The main question is whether or not you have a great deal of heat envolved.
If you encapsulate, you really limite the cooling properties of all the components unless you attach heat sinks [noparse][[/noparse]where appropriate] that extend out of the encapsulation.
If their is very little heat, silicon rubber from a hardware shop will do it and be easier to cut into if you need to repair.
On the backs of circuit boards that I have on my bench, I use hot glue to protect from accidental shorts.
It can be peeled off for repair.
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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)
······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
If you're looking for tamper-proof, then it sounds like you'll want your circuit 'potted' in the end.· Point Google toward 'potting compound' and the 'potting of electronic·circuits' - maybe these terms·will be better suited to what you're looking for.· Many times the end result of this technique is just like you described in an earlier post:
·· "something like the hard black plastic resin that is poured into a small open top enclosure with just the hook up wires sticking out"
meredth78
Posts: 18
Comments
Do you ever want to be able to work on it again?
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·
Steve
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
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Happy new year
Tim
The epoxy I like is DP270 from 3M, electronic encapsulation epoxy. It has a long pot life and very low viscosity to flow into voids, good thermal and mechanical properties, and does not chemically attack components.
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Tracy Allen
www.emesystems.com
Able to survive being rained on?
Able to survive being submerged?
Able to survive being bashed through brush and ice while attached to a Labrador Retriever's collar?
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Best Regards
Manuel C. Reinhard
Have you ever thought of using canning wax??? I have used it on small flasher boards, and had no problem with water getting in....
Bob N9LVU
3M's epoxy is by far the easiest to get ahold of.
The main question is whether or not you have a great deal of heat envolved.
If you encapsulate, you really limite the cooling properties of all the components unless you attach heat sinks [noparse][[/noparse]where appropriate] that extend out of the encapsulation.
If their is very little heat, silicon rubber from a hardware shop will do it and be easier to cut into if you need to repair.
On the backs of circuit boards that I have on my bench, I use hot glue to protect from accidental shorts.
It can be peeled off for repair.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)
······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
·· "something like the hard black plastic resin that is poured into a small open top enclosure with just the hook up wires sticking out"
Tim
Tim