[sdiy] (no subject)

[Needham, Alan]

I have recently decided to use some SMT tempcos with wire tails in lieu
of 'proper' through-hole resistors on VCOs.

Some of the SDIY gang have used epoxy resin to encapsulate SMTs in this
sort of application to provide some physical strength, is there any
evidence of the set epoxy changing the component properties? Has anybody
actually checked?

I ask this because decades ago, I read about a tiny radio transmitter
working fine until epoxy encapsulated and the fault being blamed on the
resin 'crushing' the components as it cured and altering the tuning, I
cannot remember if the faultfinding revealed if it was caps, coils, or
whatever and I am only interested in the tempco here so it could be
irrelevant.

Any thoughts on this?
Thanks.



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