digital output pcb mounting, is there a reason for it? wire to a chasis mount ok? - diyAudio
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Old 5th September 2010, 02:52 PM   #1
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Default digital output pcb mounting, is there a reason for it? wire to a chasis mount ok?

I notice most dac have pcb mount digital output and place near to chassis,


if I were to DIY a dac , place the pcb in the middle of a chassis, I need to wire this output to the chassis? any problem? I have never seen digital output wired this way


thinking of using this mount to wire to the pcb

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Old 6th September 2010, 12:16 AM   #2
wwenze is offline wwenze  Singapore
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The earlier it reaches the PCB the earlier it reaches the receiver chip and after that it can forget about keeping the required impedance. Additional connectors and terminations the signal goes through are additional potential sources of impedance mismatch and hence signal reflections.

Audio-gd products use wires between the connectors and PCB:
Audio-GD Company

And another one:
Click the image to open in full size.

What is done in the above photo is correct - using cable and connector with the correct impedance. Using any 2 bare wires and soldering it straight to the PCB like what is done in the first link is a no-no.
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Old 6th September 2010, 02:48 PM   #3
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uhmm so is audio-gd correct or wrong?
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Old 6th September 2010, 05:32 PM   #4
DF96 is offline DF96  England
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A non-insulated chassis mounted socket could disturb the grounding arrangements. Analogue signal ground, digital ground and safety ground have to be connected carefully, otherwise you can get injection of hum or hash.
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Old 6th September 2010, 06:00 PM   #5
qusp is offline qusp  Australia
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Quote:
Originally Posted by alamakazam View Post
uhmm so is audio-gd correct or wrong?
wrong
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