[sdiy] expo pair "heat shield?"

[Ben Stuyts]

I have used heat-conducting adhesive in the past for glueing a sensor + heater block + power resistor together. Could also be used for glueing an expo-pair and/or PTC. Something like this for example: https://nl.farnell.com/mg-chemicals/9460tc-3ml/white-conductive-epoxy-adhesive/dp/3805506 <https://nl.farnell.com/mg-chemicals/9460tc-3ml/white-conductive-epoxy-adhesive/dp/3805506> or https://nl.farnell.com/mg-chemicals/8329tcs-6ml/adhesive-2part-epoxy-syringe-6ml/dp/2811937 <https://nl.farnell.com/mg-chemicals/8329tcs-6ml/adhesive-2part-epoxy-syringe-6ml/dp/2811937>

Ben


> On 11 Oct 2022, at 15:37, Matthew Skala via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> On Tue, 11 Oct 2022, Neil Harper via Synth-diy wrote:
> 
>> just wondering if anybody thinks it's worth encasing an exponential pair
>> for stability. while this is in my modular case, there must be some heat
>> currents moving around from the other stuff that share the same space.
>> 
>> Maybe a dab of hot-glue-gun (hot snot), or a silicone or something?
> 
> I put two TO-92 transistors face to face, with a cable tie to hold them
> together tightly, and I usually also add a dab of general-purpose plastic
> glue on top to keep the cable tie from sliding off.  I don't know if
> that's absolutely optimal, but I think it's good enough for the VCFs in
> which I use it.
> 
> The next meaningful level up would be having the transistors on the same
> die; and the level after that would be a temperature-controlled oven.  I
> don't think just insulating or shielding them without those measures would
> make much difference - stuff like self-heating effects will be bigger than
> air currents in most cases, given that you're already using a pair of
> transistors.  Having two transistors means anything that affects both of
> them, like general ambient temperature variation, should already be at
> least partially compensated.
> 
> -- 
> Matthew Skala
> North Coast Synthesis Ltd.
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