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I was thinking of building a switch using the Darwin, but before I picked it up I wanted to ask if there's anything I need to add or change to use it as a SPDIF switcher? From what I've read, SPDIF requires a 75ohm impedance for the cable, do I need to add a resistor to keep the impedance the same inside the switch?
Thanks,
Ben
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Rank: Administration
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You would not want any 75R (10K is fine) resistors to GND until the receiver. You should not need to add anything, and you should be able to switch both the SPDIF GND, and signal, which is nice. Have fun!
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Rank: Advanced Member
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Joined: 7/30/2007(UTC)
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Thanks for the info! It'll be nice to make my own digital source selector :)
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Rank: Member
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Joined: 4/21/2007(UTC)
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Location: Minnesota
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Add-on question for Brian, Russ, or anybody... I don't mind asking an elementary question because the answer may help others who are beginners like me. [I'll just hide behind my login pseudonym!] I was hoping to make minor mods to one of my Darwin boards but there is one thing I need to understand. What is the role of the resistors to ground? In my application the sources have plenty of drive and the next component upon output will be the TXD module in the TXO. If the resistors to ground on the Darwin are useful in this case, must they be on BOTH the input and output sides of the switching relays? francolargo 
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Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
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The resistors to GND are there just to ensure the none of the inputs are floating. The sources don't like floating outputs, and some amps don't like floating inputs. These resistors ensure neither case should occur. They are optional. Cheers! Russ Edited by user Friday, March 7, 2008 5:19:52 PM(UTC)
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Rank: Member
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Joined: 4/21/2007(UTC)
Posts: 59
Location: Minnesota
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Thanks so much, Russ! ...will implement...
By using pins 2 and 7 on the relay I have one Darwin board switching each of 6 channels between two inputs - one SE, one balanced. Obviously, it's an either-or source selection and the individual balanced grounds do not switch. Although not elegant, soldering to the tails of the relay pins was straightforward and unwanted circuit traces are adequately spaced to be easily cut. I still have lots to build before I get to hear the results...
Your generous advice is much appreciated!
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