Description

Audio Injector Stereo Sound Card for the Raspberry Pi
The Raspberry Pi audio injector soundcard. Providing 2 channels of audio input and 2 channels of audio output. Including hardware volume control for both inputs and outputs. Including a headphone preamp+jack and an inbuilt microphone.
Also providing the same GPIO header, so that you can stack more hats !
This soundcard boasts low jitter operation using a crystal driven codec as the timing master. For high sound quality, it uses tantalium DC decoupling capacitors. It boasts 32 bit operation and its driver is pre-shipped with the Raspberry Pi kernel. For ease of use, input and output volume knobs are provided, just turn them up full volume to bypass.
Our challenge was to give you a well designed high quality audio sound card at an affordable price. The Audio Injector is perfect if you want to do an audio project with your Raspberry Pi, whether it requires audio input, output or both. (new update – a headphone jack has been added – and an inbuilt microphone – see the updates for more info).
Example projects
Voice command: Perhaps you want build a voice activated home automation system. This will utilise the input audio functionality of the Audio Injector. Check the pledges which include inbuilt microphone.
Audio input : Do you require a microphone input for a home automation or radio project ? Some pledges come with the suitable sound card and dynamic microphone preamp.
Spectrum analyzer : Plug a microphone preamp into the input audio lines and use jackd with brianalyze. You can also purchase a microphone+preamp pledge here which will provide some of what you need.
Karaoke: Plug in a Flatmax Studios Micromixer and a microphone and you can enjoy instant Karaoke !
DLNA and Airport express player: using the output audio functionality of the Audio Injector, you can easily setup a DLNA player. This will let you play music from your phone wirelessly or over the network.
Phone applications : As you have both input and output of sound, you can use phone software with the Audio Injector Sound Card.
LED audio display: Capture the audio and send pulses over the gpio pins to leds. Pipe the audio straight through to the output with zero latency – using the bypass functionality.
Specifications
Microphone: Inbuilt electret microphone with mixer controls. Allowing voice control or other applications.
Headphones: 50 mW max power into 16 ohm and 30 mW max power into 32 Ohm headphones (check the updates to see more)
Driver : ALSA
Latency: As low as 0.54 ms in or out (that is 540 microseconds !)
Linux : Already integrated into the Raspberry Pi kernel. If you have an older version of the kernel, simply run “rpi-update” if you need to. Edit /boot/config.txt and set dtoverlay=audioinjector-soundcard
DAC and ADC : 96 kHz, 32 bit audio.
Analog Voltage : 3.3 V rail to rail. Separate linear supply to reduce noise.
GPIO : Standard 40 Pin header, broken out above the add on card to accept more add on cards and hats.
Get help or support on :
github.com/Audio-Injector