A New approach of Volume Control: AAVA (Accuphase Analog Vari-gain Amplifier) - Page 2 - diyAudio
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Old 29th June 2011, 03:37 PM   #11
Leon08 is offline Leon08  Germany
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But they keep the schematic secret.That's the problem.And you need to write the code for MCU.
This can be more difficult then you think.

Last edited by Leon08; 29th June 2011 at 03:41 PM.
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Old 29th June 2011, 03:52 PM   #12
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it might be good idea. Specially that I am software developer and some times ago I use to work with C/C++. Will think about it....
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Old 29th June 2011, 03:53 PM   #13
maxw is offline maxw  United Kingdom
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Use an arduino, the coding is simple
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Old 29th June 2011, 03:58 PM   #14
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1024 steps will be fine. No need for 65536. Specially that for 1024 you need less opamps, less switches etc... And encoder will be cheaper. Actually there can be two version. I will have to read more about Arduino platform. It might be good also for different projects.

Do you think this circuit can be use as the base? Accuphase AAVA Volume Control

But with some switches instead of JFETS...
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Old 4th July 2011, 08:26 AM   #15
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Loading the vas (a high impedance or "current" node) down, methinks. Similar to what Ayre does. Must be done outside of feedback loops.
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