[mythtv-users] rPi3 3.5mm audio out

Tim Draper veehexx at zoho.com
Fri Oct 20 18:14:49 UTC 2017

 ---- On Fri, 20 Oct 2017 15:15:32 +0100 Peter Bennett <cats22 at comcast.net> wrote ---- 
 > On 10/20/2017 05:32 AM, Tim Draper wrote: 
 > > i know a few people here use rpi3's as an FE - maybe you use the 3.5mm output also? 
 > > 
 > > i've recently tried to get one of my rpi's working with 3.5mm audio to use my conservatory built-in speakers. It kinda works but found i need to run it through an external amp to get any sort of reasonable volume out of it. So I bought a LEPY LP-2020A that has 3.5mm in, and i've bought a 4pin 3.5mm cable for the rpi side (a normal 3pin caused audio clicking but was fine when plugged into my phone for testing). 
 > > this 4pin cable doesnt work at all with the rpi or my phone. i doubt it's a simple case of bad cable as i bought & tested 2 cables with same issues. 
 > > 
 > > what type of cable are you using? i thought i bought the right 4pin cable but with it working less than the 3pin i've obviously bought wrong. maybe i need to go 4pin on the rpi end, and 3pin/RCA on the Lepy amp end? 
 > > ...or maybe you went for a DAC-HAT? 
 > > 
 > > 
 > > 
 > I also had very low volume. The fix was in software. No external  
 > amplifier needed. 
 > Put  file .asoundrc in your home directory. I pasted it here  
 > https://pastebin.com/9viBwNMp 
 > Select ALSA:default as your sound device (you may have to key it in if  
 > it is not in the list) 
 > Add these to your .profile or somewhere it will run before you start the  
 > frontend: 
 > amixer set PCM Playback 100% 
 > amixer set Pre-Amp Playback  9 
 > You can adjust the values as needed. You can also run alsamixer to see  
 > and adjust the pre-amplification. 
 > I suppose I should add this to the wiki. 
 > Peter 
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low volume was another issue i was getting, but after a while looking into it, no-one seemed to have a fix. your script seems to be something i've not seen till now and a lot more complete. worth a go as it would simplify things and improve the WAF

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