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Cheap/simple relay/resistors attenuator for RPI
Cheap/simple relay/resistors attenuator for RPI
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Old 9th December 2018, 06:44 AM   #31
mbrennwa is offline mbrennwa  Switzerland
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That's what I did to add a volume control to my 'external' DAC. I have since move on to a different setup (not so.mucg related to the relay attenuator). Let me know if you want my relay board.
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Old 9th December 2018, 10:12 PM   #32
TrueReligionVinyl is offline TrueReligionVinyl
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Thank you mbrennwa; I have PM'ed you.


Looking at the Volumio documentation, the graphical volume control goes from 0 to 100, but the Allo attenuator goes from 0 to 64. Has anyone tweaked the Volumio source to get a one-to-one mapping from UI to attenuator dB? I will use this for recording, so if my current level peaks at -15.6 dB, then I want to add exactly 15 dB so that my recording peaks at -0.6 dB. That means I need a one-to-one mapping from UI to attenuator level.
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Old 10th December 2018, 08:02 AM   #33
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by TrueReligionVinyl View Post
the graphical volume control goes from 0 to 100, but the Allo attenuator goes from 0 to 64. Has anyone tweaked the Volumio source to get a one-to-one mapping from UI to attenuator dB?


Yep, Volumio (or the corresponding plugin) does that.
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