Analog Amplifier for Pine64
#1
Hi,

I would like to make an car amplifier extension board. Can anyone suggest me about the following topics:

- Volume adjustment (volume can be adjusted over I2C, what is the best way, adjusting volume of analog output of pine64 or tas524C)
- Audio input, there are four channels, pine64 has only 2 ch output. How can I do it?
- Fault, Mute, standby, clip_otw, is it necessary to use these pins with Pine?

http://www.ti.com/lit/ds/symlink/tas5424c-q1.pdf
(typical application circuit attached)

Thanks


Attached Files Thumbnail(s)
   
  Reply
#2
I would probably program a fixed volume on the amplifier and regulate the rest from the audio codec side so you have normal software controls, but it also depends on the output/input drive levels of your amplifier circuit. As for four channel audio, do you need 4 different channels in your car? Usually it's only two with left front/back and right front/back so you just buffer the output from the Pine and feed that to two inputs? As for the control signals, that's up to how you want to use your amp and has basically nothing to do with the Pine... I would route them to some GPIO and set sane default logic levels... Maybe also add isolation for the audio path / power supply to avoid ground loops... Since you control some things via I2C you probably need to develop a 'fake' soundcard driver so you have a mixer device to control things....
Come have a chat in the Pine IRC channel >>
  Reply
#3
I have a quick question,

According to this schematic is the output differential or not? As far I see it is not, how can I make it differential?

I found the evolution module schematics but doesnt seem well, the resolution of the pdf is very low.

http://www.ti.com/lit/ug/slou359/slou359.pdf

I would like to add si4703 fm module to the system but how can I convert the signal from single ended to differential?
  Reply


Possibly Related Threads…
Thread Author Replies Views Last Post
  Pine64 and Nexdoc mcf 11 18,657 12-05-2017, 03:10 AM
Last Post: Pander
  Mounting RPI3 "hats" on Pine64 gczuczy 5 9,641 07-30-2017, 10:29 AM
Last Post: KnReLe
  ZJ080NA-08A and pine64 mbt28 4 6,486 10-10-2016, 05:12 AM
Last Post: mbt28
  Euler bus/Pi2 bus on Pine64 xxvolwarexx 1 5,715 10-05-2016, 06:35 PM
Last Post: pfeerick
  Adafruit 16x2 LCD doesn't turn on with Pine64 mypineme 13 15,951 08-27-2016, 02:41 AM
Last Post: mypineme
Exclamation Pine64+ not starting (never) Alex89cgn 1 3,323 08-15-2016, 12:05 PM
Last Post: MarkHaysHarris777
  Pine64 Eagle LBR openhardwarecoza 3 5,650 08-01-2016, 11:05 AM
Last Post: xalius

Forum Jump:


Users browsing this thread: 2 Guest(s)