Hi, thought you may like to see a picture of the pre-production Pi-AMP (iqaudio.com/?page_id=34).
This Raspberry Pi sized Class D stereo amplifier delivers stunning audio quality - suitable for any audio project and particularly useful when combined with i2s based DACs such as the IQaudIO.com Pi-DAC with built in hardware volume control.
The IQaudIO.com Pi-AMP is based on the Texas Instruments TPA3118D2. We’ve focused exclusively on audio quality components throughout to deliver an exceptional sonic performance. It sounds fantastic - even with a simple 12v 1.5amp wall plug!
We expect to conclude the design and sign off for mass production in the coming weeks, ready for summer - at what we believe is a great price.
There’s no special Linux driver or similar needed but for those who wish to enable / disable the amp from under software control this is possible via one of the Pi’s GPIO.
We’ve done something different for headphones - we’ve released the Pi-DAC+ (for the Raspberry Pi B+ model). It has the same great TI PCM5122 DAC but also a brilliant little headphone amp so you can use the Pi in your office, for personal listening or similar.
The Pi-AMP is in development and has morphed slightly to become the Pi-AMP+ and will now sit atop the Pi-DAC+.
That’s very interesting and would make a nice AIO solution for some compact network attached player. Add very efficient drivers with low Vas and you have a winner , something around the Fostex 80/100mm full range drivers.
Hi everybody !
I recieved yesterday (Wenesday) my PI dac+ and PI-amp+ (ordered Saturday !!!) Thank you Gordon !
The Psu is 15V is a brick bought with the rest.
First impression : it is very small !!!
After some minutes spent to assemble with the RPI b+, it was test time !
First fear, no sound, even if lights were on.
I check in Volumio config : all was ok…
So I ask Gordon and he gave a very quick answer to unmute the amp.
About the sound ?
Fire ! Whaou!!!
I only did quick tests, but it sound very well. I was happy with my previous system (ess9023 dac and TPA3116 blueboard amp) but it is really another level. I can’t say if it comes from the dac or the amp or both. The basses are very punchy. The medium and voices are less agresifs than before. It’s very clear with a good stereo image very detailed.
So I’m going to carry on to test with various music in flac stored on my nas!
Hello,
The pi-amp is mute by default to protect loudspeakers when power on. It needs to be unmute and there is two ways :
hardware : just by fitting a jumper to the two exposed pins P9
software : by using GPIO ( I use wiringpi and it works)
The link for that : iqaudio.com/?page_id=485
My question is : how to set the unmute mode using GPIO in Volumio at boot time -> in rc.local ? or elsewhere
And for the shutdown of the system ?
Any advice / experience ?
Thanks !
Hi!
I’m stuck with this problem of unmute the pi-amp at boot time.
If I type the command given in this page iqaudio.com/?page_id=485 in a terminal, it works.
So I try to put it in the /var/www/_OS_SETTINGS/etc/rc.local
[code]#!/bin/sh -e
rc.local
This script is executed at the end of each multiuser runlevel.
Make sure that the script will “exit 0” on success or any other
value on error.
In order to enable or disable this script just change the execution
bits.
By default this script does nothing.
/var/www/command/player_wdog.sh startup & > /dev/null 2>&1
/usr/local/bin/gpio mode 3 out
/usr/local/bin/gpio write 3 1
exit 0
[/code]
But it doesn’t work.
So I wrote a script I called “unmutepiamp” containing the command
#!/bin/bash
/usr/local/bin/gpio mode 3 out
/usr/local/bin/gpio write 3 1
echo "pi-amp unmuted"
exit
When I launch the script, pi-amp is unmute !
So I invoke this script in the /var/www/_OS_SETTINGS/etc/rc.local
But it still not works
I did the same in /etc/rc.local and no more success.
I really don’t know how to do…
Sorry, I missed this post - if you don’t have it up and running yet then please download the pre-configured Volume SD card image from www.iqaudio.com/downloads