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Potentiometer Amp2

eaedev

October 19, 2020 13:32

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Hi all,

I am trying to mount a speaker with an Amp2 and a raspberry pi 4. I am stuck with volume control:

• I have tried using a rotary encoder but every time I try to increase or reduce volume, music stops for a little bit (less than a second)
• I also have tried using a stereo potentiometer (logarithmic, for sound systems). I know that using this solution will imply to go have an independent control volume ( if I decrease volume manually, I have to increase manually again if I want to gain access to full potency) but I have no clue about what variable resistance should I look for. I think that amp output is 30W and 2A, right? How many ohms should I use for the variable resistance?

Thanks in advance.

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8 comments

• 0
  
  HiFiBerry team October 19, 2020 16:05

  What exactly did you do to use a rotary encoder? The music should not stop for this. You might simply try another software.

• 0
  
  eaedev October 19, 2020 17:14

  Hi,

  I use hifiberryos and followed this tutorial https://github.com/hifiberry/audiocontrol2/blob/master/doc/rotary-controller-plugin.md

  The rotary encoder looks the same as the one in the tutorial.

• 0
  
  HiFiBerry team October 19, 2020 17:23

  That's strange. That should not happen. It's possible that you did configure and/or connect the SWITCH incorrectly as this will pause/play.

• 0
  
  eaedev October 19, 2020 17:37

  I have checked multiple times that connections follow the guide and pins are defined properly.

  Here is an example of how it sounds: https://sndup.net/4xzx

• 0
  
  HiFiBerry team October 19, 2020 17:39

  What source is this?

• 0
  
  eaedev October 19, 2020 17:43

  Spotify through Bluetooth from a mobile phone.

• 0
  
  HiFiBerry team October 19, 2020 17:55

  That might be the problem. BT volume control is a bit "rough". I recommend to either use Spotify connect or Airplay for this.

• 0
  
  eaedev October 19, 2020 18:15

  OK, I am going to try using connect or airplay.

  In addition I will keep my research for potentiometer!

  Than you for the help.