IQaudIO IQA003 User manual

Chipsmall Limited consists of a professional team with an average of over 10 year of expertise in the distribution
of electronic components. Based in Hongkong, we have already established firm and mutual-benefit business
relationships with customers from,Europe,America and south Asia,supplying obsolete and hard-to-find components
to meet their specific needs.
With the principle of “Quality Parts,Customers Priority,Honest Operation,and Considerate Service”,our business
mainly focus on the distribution of electronic components. Line cards we deal with include
Microchip,ALPS,ROHM,Xilinx,Pulse,ON,Everlight and Freescale. Main products comprise
IC,Modules,Potentiometer,IC Socket,Relay,Connector.Our parts cover such applications as commercial,industrial,
and automotives areas.
We are looking forward to setting up business relationship with you and hope to provide you with the best service
and solution. Let us make a better world for our industry!
Contact us
Tel: [phone] Fax: [phone]
Email & Skype: [email protected]om Web: www.chipsmall.com
Address: A1208, Overseas Decoration Building, #122 Zhenhua RD., Futian, Shenzhen, China
  

IQaudIO
User Guide
This document covers the installation, software configuration and
usage of IQaudIO audio cards for the Raspberry Pi.!
If you would like to see additional information within this document please email us at
[email protected]
v27!
IQaudIO!Limited,!Company!No:!09461908!
For those who simply need the /boot/config.txt
details —> Just jump to section 1

IQaudIO user instructions
Contents
1) Getting started
2) The Pi-DAC+
3) The Pi-DigiAMP+
4) The Pi-AMP+
5) The Pi-DAC PRO
6) The Pi-Digi+
7) The Pi-DACZero / ZeroHeadphone
8) Connecting the Pi-DAC+ to your Raspberry Pi
9) Connecting the Pi-DigiAMP+ to your Raspberry Pi
10) Connecting the Pi-AMP+ to your Pi-DAC+
11) Building the Raspberry Pi and IQaudIO sound cards into your Pi-CASE+
12) Configuring Linux/Raspbian to include sound card support
13) Checking audio is working through the IQaudIO sound card
14) Advanced troubleshooting
15) Controlling the Pi-AMP+ or Pi-DigiAMP+’s Mute / Un-mute
16) Common Linux audio distribution configurations
17) Adding the optional PIN headers to the Pi-DAC+
18) Advanced hardware information
19) Adding a Rotary Encoder (Physical volume control)
20) Adding an IR (Remote Control) Sensor
21) Sonic_Pi and IQaudIO
22) Storing alsamixer settings
23) Using external USB devices
24) MPD based audio with volume control
25) Useful data (screw sizes / part numbers / wire gauge size etc.)
v27!  ! !!!!! 10-Sept–2017!2

1) Getting Started
Thank you for choosing an IQaudIO sound card. Next you need to play music, but first you may need
to configure the Raspberry Pi’s Linux OS.
You will find several audio applications with pre-configured Micro SD Card images on
www.iqaudio.com/downloads we also include quickest images which will help you check that you
have the IQaudIO sound card installed correctly on your Raspberry Pi.
What output does each IQaudIO card support?
Each of the IQaudIO sound cards has a specific purpose. Chose the correct sound card for your
specific need:
Enabling the IQaudIO sound card in Raspbian / example SD card images.
The following will help you check your sound card is working and it’s configured correctly.
Disabling the standard Raspberry Pi On-Board Audio
You may want to disable the Raspberry Pi’s on-board “low quality” audio card. This is done simply by
commenting out the {dtparam=audio=on} device tree parameter in your /boot/config.txt file by placing
a #at the start of the line, saving the file and rebooting
!dtparam=audio=on!
"#$%&'()*$+&
,-$&./(0-1
2'0-)3%4)56*78
9$:$0;-&)5<268)
=.-$>-+1
?'@'4$:)3%4.%4
Pi-DAC+
Pi-DAC+!/!AMP+
Pi-DigiAMP+
Pi-DACZero
Pi-DACZero!
Headphones
Pi-DAC!PRO
Pi-DAC!PRO!/!AMP+
Pi-Digi+
















"#$%&"3)*$+&
AB((4A;(0C'@D4E4
#%';>4-14)'F@
Pi-DAC+
dtoverlay=iqaudio-dacplus
IQ_0_quicktestDAC_DigiAMP_AMP.zip
Pi-DigiAMP+
dtoverlay=iqaudio-dacplus,unmute_amp!!
or!
dtoverlay=iqaudio-dacplus,auto_mute_amp
IQ_0_quicktestDAC_DigiAMP_AMP.zip
Pi-DACZero
dtoverlay=iqaudio-dacplus
IQ_0_quicktestDAC_DigiAMP_AMP.zip
Pi-DAC!PRO
dtoverlay=iqaudio-dacplus
IQ_0_quicktestDAC_DigiAMP_AMP.zip
Pi-Digi+
dtoverlay=iqaudio-digi-wm8804-audio
IQ_0_quicktestDigi.zip
v27!  ! !!!!! 10-Sept–2017!3

What’s Headless?
Many of the software packages used with the Raspberry Pi simply turn the Pi into a Headless end-
point. That is to say that it doesn't need to or expect a screen to be attached to the Pi’s HDMI socket.
So if there’s no screen how do you control it?
Well in some cases you don’t need to do anything with the Pi at all. Take the RoonLabs images,
these turn the Pi into a Roon Certified end-point. The Pi is then controlled form the RoonLabs PC/
Mac application which connects to and plays music through the IQaudIO sound card.
This is again similar with the Shairport-sync utility - it turns the Pi into a Apple Airport compatible
speaker, music and volume is then controlled from your iPad / iPhone, or iTunes. Below, LivingRoom
and Snug are both RaspberryPi running Shairport-sync.
Other “headless” applications install a web server onto the Pi, so to control it you simply open a
browser window on your PC / Mac / Tablet or similar and interact with the Pi based application
through a web page. Applications such as MoodeAudio, Volumio and RuneAudio work this way.
v27!  ! !!!!! 10-Sept–2017!4

How do I install software on the Pi?
The Raspberry Pi loads its software from the micro-SD card. Most audio applications assume they
are the only thing running on the Pi so most require a dedicated SD card. The applications are
normally distributed as a compressed .img file (likely a .zip or .gz file) and this .img file will need to be
written to the Pi’s SD card to allow the Pi to boot.
Can’t I just copy the .img file over to the Pi?
Err, no. Doing this will just store the .img file on the SD card. The Pi needs the SD card to be
formatted in a particular way to allow it to boot / start up and run. Don’t worry, there are several ways
to do this and some are VERY simple.
Got a Mac? Get ApplePi-Baker - https://www.tweaking4all.com/
Use Windows? Use Win32DiskImager - https://sourceforge.net/projects/win32diskimager/
Top Tip: Buy a few extra micro SD cards, you’ll find it much easier to try things. Also, once you have a
working Pi SD card, back it up to your PC/Mac. It’s easier to re-write the SD card if things go wrong.!
v27!  ! !!!!! 10-Sept–2017!5

2) The Pi-DAC+
The Pi-DAC+ is a fully HAT compliant add-on accessory for the Raspberry Pi A+/B+/Pi2/Rpi3.
The Pi-DAC+ takes the digital audio signals (I2S) from the Raspberry Pi and through the onboard
Texas Instruments PCM5122 DAC delivers variable output (hardware volume control) analog audio to
the Pi-DAC+’s Phono connectors. The PI-DAC+ also, via the Texas Instruments TPA6133A
headphone amp, supports the direct use of headphones via the Pi-DAC+’s 3.5mm audio jack.
The Pi-DAC+ can be connected to the Raspberry Pi’s 40way pin header without any additional
soldering.
Component selection and track layout have been in the forefront of our design to ensure noise
immunity and best possible audio playback with the Pi-DAC+.
Pi-AMP+ Power delivery HAT EEPROM Write Enable Headphone Socket
Rotary Encoder Header
IR Header Pi-DAC+ Audio out (for Pi-AMP+) Phono Connectors
v27!  ! !!!!! 10-Sept–2017!6

3) The Pi-DigiAMP+
The Pi-DigiAMP+ is a fully HAT compliant add-on accessory for the Raspberry Pi.
The Pi-DigiAMP+ takes the digital audio signals (I2S) from the Raspberry Pi and through the onboard
Texas Instruments TAS5756M PowerDAC delivers direct connection to stereo speakers at up to
2x35w with variable output. Adjustable gain (+20db or +26db) is selectable by a pin header P7 (not
shown below). Only remove and set this when NO POWER IS APPLIED.
The Pi-DigiAMP+ can be connected to the Raspberry Pi A+/B+/RPi2 or RPi3’s 40way pin header
without any additional soldering. The Pi-DigiAMP+ requires a 12-19volt power source to operate.
Power should be applied via the Pi-DigiAMP+’s standard barrel connector or the two pin JST socket
provided.
The Pi-DigiAMP+, when powered, has been designed to provide power to the Raspberry Pi and Pi-
DigiAMP+ combination safely. You can continue to use your Pi devices without risk of damage. The
Pi-AMP+ is by default muted at power on (mute LED lit). Mute state / LED is under software control
(Raspberry Pi GPIO22). Component selection and track layout have been in the forefront of our
design to ensure noise immunity and best possible audio playback / experience with the Pi-DigiAMP
+.
Power LED Mute LED GPIO Header
!
Power In (12-19v) Speaker Terminals
v27!  ! !!!!! 10-Sept–2017!7

4) The Pi-AMP+
The Pi-AMP+ is an add-on accessory for the Pi-DAC+ and Raspberry Pi.
The Pi-AMP+ takes the variable output analog audio from the Pi-DAC+ and through the onboard
Texas Instruments TPA3118D2 Class D amplifier delivers audio to the Pi-AMP+’s speaker terminals
delivering up to 2x35w@19v input.
The Pi-AMP+ requires a 12–19volt power source to operate. Power should be applied via the Pi-AMP
+’s standard barrel connector or the two pin JST socket provided.
The Pi-AMP+, when powered, has been designed to provide power to the Raspberry Pi / Pi-DAC+
and Pi-AMP+ combination safely. You can continue to use your Pi devices without risk of damage. As
with the Pi-DAC+, we’ve focused on the components selected and the attention to audio performance
during PCB layout when developing the Pi-AMP+.
The Pi-AMP+ is by default muted at power on (mute LED lit). Mute state / LED is under software
control (Raspberry Pi GPIO22) but mute may be overridden by shorting the Pi-AMP+’s P9 pins with a
suitable jumper – note the mute LED will remain lit if P9 is shorted.
Pi Power out 12v-19v Power In Speaker Terminals

Audio In (from Pi-DAC+) Mute Override (P9)!
v27!  ! !!!!! 10-Sept–2017!8

5) The Pi-DAC PRO
The Pi-DAC PRO is a fully HAT compliant add-on accessory for the Raspberry Pi.
The Pi-DAC PRO users the Texas Instruments PCM5242 to deliver outstanding Signal to Noise
Ration and supports Balanced / Differential out in parallel to Phono / RCA line level output. It also
includes the IQaudIO Headphone amp.
The Pi-DAC PRO can be connected to the Raspberry Pi A+/B+/RPi2 or RPi3’s 40way pin header
without any additional soldering. The Pi-DAC PRO is powered from the Raspberry Pi.
HAT EEPROM Write Enable Headphone Socket
Power LED Rotary Encoder Header
Left Differential out (P7) Right Differential out (P9) Phono / RCA out!
v27!  ! !!!!! 10-Sept–2017!9