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Volumite - bu24 - psu arrangement and board positioning
Rank: Advanced Member
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Joined: 9/9/2008(UTC)
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Hi Russ, Brian. I'm thinking about adding a volumite to my buffalo 24 (pic below). I'm wondering about optimal psu and physical placement though. Currently using teddyregs for the buffalo (Ivy disconnected at moment and output cap coupled from buffalo) and separate 3.3v ref on breadboard. I'm thinking of taking power from that separate 3.3v board for the volumite. As this is fed from the teddyreg will there be issues with startup times (buffalo and volumite will in theory both come up at the same time) Also, where to put it. Options seem to be: 1. put the board on the front of the case with leads running back to the buffalo board. (concerned about length of these leads) 2. Mount the board at the back of the case with the pot on the front fascia with leads running from pot back to the volumite board. Grateful for any input Cheers James 
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What version of the Buffalo do you have? If the I2C header has the VDD output, I would definitely power the Volumite from there. You may still have timing issues though; I cannot say for sure.
As for the board location, it would certainly be easier to mount it to the front of the chassis as designed. It looks like you could route the wires to the left, along with the MUX control wiring. There is not a lot of I2C communication going on, so I wouldn't be too worried about noise.
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Rank: Advanced Member
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Joined: 9/9/2008(UTC)
Posts: 78
Location: UK
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Thanks Brian. Buffalo is v1.1. No VDD output as far as I can see.
wrt to wiring, do I run the I2C wires from mux to volumite and then to buffalo, or mux to buffalo, buffalo to volumite?
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Rank: Administration
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Sorry, I did not mean that to be confusing. You run from Volumite to Buffalo. I just meant you could run them the same way (path) you ran the MUX wiring in your picture.
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Rank: Advanced Member
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Joined: 9/9/2008(UTC)
Posts: 78
Location: UK
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Sure, sorry, don't think my question was clear! Should the volumite basically sit in the middle of the mux and buffalo wrt to wiring, so: I2S on mux > volumite > I2S on Buffalo or, do I keep the I2S wiring from mux to buffalo as it stands and and in 4 more wires from buffalo to volumite? Hope that makes sense, and apologies if I'm being a numpty. Cheers James Edit: one further question - how long is the shaft on the pot that ships with the volumite? Edited by user Wednesday, July 15, 2009 8:24:52 AM(UTC)
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Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA
Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
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I see the source of confusion... The Volumite communicates with the Buffalo using I2C, not I2S. I2C is a serial data communication format. I2S is a serial audio format. So, you should leave the MUX and Buffalo connection alone. It is just right. The Buffalo has an I2C header near the Left analog output, which is where the Volumite connects. PS: No numptiness detected... :) Edited by user Wednesday, July 15, 2009 8:33:16 AM(UTC)
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Rank: Advanced Member
Groups: Member
Joined: 9/9/2008(UTC)
Posts: 78
Location: UK
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aha, yes I2C/I2S confusion it was! Thanks Brian 
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