Rank: Member
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Joined: 6/17/2012(UTC) Posts: 4 
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Hello!
I am planning on using the Buffalo III module with a tube output stage and there are some problems I am facing. I would need to know the exact output voltage of the BIII module (the voltage on it's output contacts). The board would be configured for single stereo operation (2 channels) and this particular information is absolutely necessary since the entire tube stage design will depend on it. Apart from the voltage, I would also need to know the exact S/N ratio because it will also influence the design of the tube stage.
Thanks very much!
Antun
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Rank: Member
Groups: Member
Joined: 6/17/2012(UTC) Posts: 4
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Doesn't anyone have an answer to this question? The output voltage would seem to be the first step in any serious diy work, especially when tubes are involved. If the voltage is below 100mV, the entire stage will have to be completely redesigned and I won't be able to use the tubes I intend to use.
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Rank: Administration
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Joined: 10/24/2006(UTC)
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I would recommend reading the integration guide, as the answers you seek are within it.
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Rank: Member
Groups: Member
Joined: 6/17/2012(UTC) Posts: 4
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Well, this is my first diy D/A converter:) Page 45 of the guide states that the current per is 4mA per channel which basically means 16mA per channel when the module is set up for two channel (single stereo) operation. Also, the stated output impedance is 780 Ohm per channel which basically means 185 Ohm per channel in stereo operation. Taking this into account, the output voltage should be 0,016 x 185 = 2,96 Volt. I will probably order it and see whether the measurements confirm this. If not, then I'll have to make modifications to the input gain of the analog stage.
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