Hi, on my MPI3508 board the headphone jack worked without any problem. You don't need any drivers.moosethemucha wrote: ↑Sun Jan 14, 2018 7:46 pmGreat guide - Currently in process of modding the screen to use less power - Thank you for everyones work.
I had a question about the screen - Has anyone gotten HDMI audio working ?
I cant seem to get it to work - does it require the GPIO header to be plugged in ? From what i could tell thats only needed for touch screen options.
I was also unable to get anything from audio on both Ubuntu 16.04 and Mac osx Seirra - both detected (including the pi) that HDMI audio was there but I couldn't hear anything ?
Does it require a special driver or something - I didn't install the 99-fbturbo.conf-HDMI as it fails during the driver install. But isn't this just for touch screen stuff ? https://github.com/goodtft/LCD-show
I would prefer to use the HDMI audio that way I could get rid of the USB DAC I'm using - meaning no usb stuff for my build which would be a great power save.
I'm going to have a look at the HDMI DAC to Headphone IC skematics and see how that works.
Do you need to amplify the signal before hand ?
I tested with earbuds. If you want to drive a speaker you need an amplifier, e.g. a PAM8403 or something similar.
The GPIO is only for the touchscreen functionality. You need a driver for this, but I would recommend to remove the touchscreen layer to get a better picture. Touch is not really usable on this display size.