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digital output pcb mounting, is there a reason for it? or can we wire to a chasis mount panel?

post #1 of 5
9/5/10 at 7:13am
Thread Starter 

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

 

R3604992-25.jpg


Edited by alamakazam - 9/5/10 at 7:45am
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post #2 of 5
9/5/10 at 11:41am

Just try to use coax cable to keep impedance.  Lots of manufacturers use PCB-mounted jacks for ease of construction (no need to solder wires).

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post #3 of 5
9/5/10 at 1:33pm

The outer conductor of the panel-mount BNC connector will be connected to the chassis ground, if your panel is metal.  The better DACs have transformer-coupled coax inputs for galvanic isolation, which requires the jack to be isolated from the chassis.

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post #4 of 5
9/6/10 at 7:50am
Thread Starter 
Quote:
Originally Posted by FallenAngel View Post

Just try to use coax cable to keep impedance.  Lots of manufacturers use PCB-mounted jacks for ease of construction (no need to solder wires).


any coax cable ? or suppose to be 75ohm rated

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post #5 of 5
9/7/10 at 12:27am

should be 75ohmn rated, but unless your transport is transformer coupled and has true solderless 75ohm BNC outputs and you are using a solderless 75ohm cable, I wouldnt worry about it too much. just the act of soldering creates an impedance mismatch, so I wouldnt be overly concerned unless you have long cables. but yes if you can use an isolated jack that would be better


Edited by qusp - 9/7/10 at 12:29am
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