[sdiy] Aluminium PCBs

[Florian Teply]

Am Freitag 27 März 2009 10:30:08 schrieb cheater cheater:
> What's this 'loss' thing?
>
Umm, this is some effect in High frequency electronics: Isolators carrying 
electric fields, a common usage would be capacitors, but also transmission 
lines in high-frequency circuits, do so quite well at low frequencies (low 
being here somewhat below a couple hundred MHz). Basically it breaks down to 
the loss tangent of the dielectric material in question, which usually is 
somewhat frequency-dependent (that is, it's getting worse at higher 
frequencies). But at frequencies we're most likely to encounter in SDIY, this 
doesn't matter.
 
> Nick: do you think that they would be good for oscillators, to
> maintain thermal inertia?
>
I'm not Nick, but i'll drop in my 2 cents anyways ;-)
Thick Aluminum-clad PCBs are commonly used in High-Power LED stuff where one 
needs to get the heat away efficiently. AFAIK it doesn't add much thermal 
capacity though. My best bet would be some sort of oven heating for 
high-stability oscillators as is done in RF because that avoids tempreature 
change by actively heating to a constant tempreature somewhere above ambient 
temperature levels to be encountered during operation.

HTH,
Florian