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Old 6th September 2013, 03:31 PM   #1
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Default switching between digital sources

I am considering making a switch box for 2 or 3 digital line sources with a line out to a DAC. I am thinking in terms of coaxial wires. I assume a regular rotary switch will do but i am unclear about handling the earth connection. Do I switch eart as well as line or do I connect to common earth in the box?
I would be very grateful for any advice.
P
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Old 6th September 2013, 05:13 PM   #2
DF96 is offline DF96  England
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I would not switch earth. Build it as though it was for RF - it is! Short connections, low inductance. If possible, measure its effect on impedance at high HF or low VHF. A local radio amateur might have an antenna analyser you can use.
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Old 6th September 2013, 08:19 PM   #3
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Many thanks, DF96!
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Old 7th September 2013, 07:36 AM   #4
Ryssen is offline Ryssen  Sweden
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I am using a box from ebay,it uses a remotecontrol,it works fine I think.
Just a hint.
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Old 7th September 2013, 11:33 AM   #5
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Hej, Åke, thanks for the hint !

I will look into this. I see there are some items there that might suit my needs, such as this: 3 WAY PHONO RCA STEREO AUDIO INPUT SELECTOR SWITCH | eBay

My digital sources already have volume control. For digital signal I would only need one channel.
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Old 7th September 2013, 11:46 AM   #6
DF96 is offline DF96  England
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Analogue selector boxes might not work too well. Depends how they are constructed. You need to maintain some rough approximation to 75 ohm impedance through the box.
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Old 7th September 2013, 12:51 PM   #7
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I see - do you think that could be achieved by tweaking?
Thanks,
P
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Old 7th September 2013, 12:58 PM   #8
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Video switch boxes should work just fine. They are designed for 75 ohm operation.
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Old 7th September 2013, 04:12 PM   #9
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Thank you Frank!
I will look into this. Perhaps one of these would do?:
Switch Boxes - Networking components for OEMs and Systems Integrators in Pittsburgh, PA
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Old 7th September 2013, 05:01 PM   #10
DF96 is offline DF96  England
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The BNC ones are almost what you need, except that they will be 50 ohm instead of 75. They might be good enough if all connections are short.
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