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Old 6th March 2014, 02:20 PM   #1
Max Headroom is offline Max Headroom  Australia
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Join Date: Jan 2013
Location: West Australia, near to the beach, natural ambient sounds mostly.
Default Novel PCB Construction

Today I saw a circuit module of unusual construction.
The method was similar to the above pic, with a 0.8mm copper base plate, and a paper thin fibreglass smd loaded pcb bonded to the upper surface of the copper base plate.
I have seen similar modules previously, but the novel (to me) feature is that vias were drilled right through the copper base plate, forming circuit ground connections to an effectively infinite system earth.

This module method also allows very effective thermal management.
A Peltier module connected directly to the module, or via a heatpipe, would allow controlled and equal temperature of all module circuit elements/components.

Pre-preamps, preamps and power amp input/driver stages would likely benefit by this technique.


Deliberately varying operation temperature of circuits could be the new audio 'tweak'.
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Old 6th March 2014, 02:48 PM   #2
marce is offline marce  United Kingdom
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Join Date: Jun 2007
Location: Blackburn, Lancs
Novel PCB Construction
Ok for simple circuits, used often for LED based. The trick is to lay out the pre-amp or DAC circuit single sided with only GND on the bottom side, similar to this DAC design I am playing with. This is single sided apart for all signals, the only vias being GND ones (ignore the far end I'm still playing, in fact I have several versions).
You can have more layers but have to use HDI interconnection to get the heat sinking benefit, main use though is simple circuits, sensors etc, and with the Au clad boards LED circuits.

For real thermal control heat pipes are the best, you can get integrated heat pipe assemblies, though theses can get rather expensive for custom ones.

Some cool ideas here:
Attached Files
File Type: pdf ESS_DAC_V1_VANILLA-08.pdf (102.9 KB, 14 views)

Last edited by marce; 6th March 2014 at 03:05 PM.
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