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GB interest check on HP amp and USB DAC
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<blockquote data-quote="Hennie" data-source="post: 12108" data-attributes="member: 20"><p>For a current output DAC:</p><p></p><p>- a resistor, followed by a passive filter stage and a valve amplifier, like this:</p><p></p><p>http://members.chello.nl/m.heijligers/DAChtml/dig_r2b.pdf</p><p></p><p>http://members.chello.nl/m.heijligers/DAChtml/suphv2b.pdf</p><p></p><p>It is not as mad as it looks. A virtual ground opamp based I/V does not provide a linear, low impedance load to the DAC at the higher end of the spectrum. It won't be quite a virtual ground anymore. There will be HF intermodulation but how much of it folds back into the audio band I am not sure. Probably not too much but it would be interesting to see a comparison with a valve stage. The design referenced above limits the input spectrum to the valve stage with a passive filter.</p></blockquote><p></p>
[QUOTE="Hennie, post: 12108, member: 20"] For a current output DAC: - a resistor, followed by a passive filter stage and a valve amplifier, like this: http://members.chello.nl/m.heijligers/DAChtml/dig_r2b.pdf http://members.chello.nl/m.heijligers/DAChtml/suphv2b.pdf It is not as mad as it looks. A virtual ground opamp based I/V does not provide a linear, low impedance load to the DAC at the higher end of the spectrum. It won't be quite a virtual ground anymore. There will be HF intermodulation but how much of it folds back into the audio band I am not sure. Probably not too much but it would be interesting to see a comparison with a valve stage. The design referenced above limits the input spectrum to the valve stage with a passive filter. [/QUOTE]
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Audio and Video Talk
Headphones
GB interest check on HP amp and USB DAC
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