The IQaudIO Pi-DigiAMP+ is the First HAT compliant Full-HD (192/24) HiFi quality DAC & up to 2x35w Class D amplifier for the Raspberry Pi. The DigiAMP+ turns your Raspberry Pi into a standalone Hi-Fi system. Use as the basis of a retro radio restoration, build a boom box, an in-car audio player or use as the basis of a kiosk / display solution.
Designed to deliver the best audio performance from the Raspberry Pi A+/B+/RPi2, fit within the Pi’s form factor and provide additional access to several of the Pi’s 40way I/O signals allowing easy addition of IR sensors, Rotary Encoder or i2c devices (such as OLED screens) etc.
The HAT uses the latest Texas Instruments chipset (TAS5756m) to deliver awesome performance from a single HAT board. As with our other products you can be assured that the Linux driver support is already built-in to Raspbian Linux (using the same device drivers as the Pi-DAC+) and supported by the many software audio packages already on the market. RuneAudio / Volumio / Moode / PiCorePlayer / PiMusicBox / OpenELEC and others. The IQaudIO Pi-DigiAMP+ easily supports 24-bit / 192kHz file formats but is equally at home with lower quality MP3s bringing your music alive sonically.
Please note that The Pi-DigiAMP+ uses GPIO22 as amp-mute and when powered on is in mute state, examples are in the user docs and many software releases already support the Pi-AMP+ in the same way.
The IQaudIO Pi-DigiAMP+ connects easily to the Raspberry Pi and provides up to 2 x 35w stereo output to speakers.
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I ordered one to give it a try in a piCorePlayer environment that I am installing in my home. The card works amazingly well. has good quality sound, and drives the speakers with adequate volume. I am running it on a Raspberry Pi 2 which handles it with almost no heat. This is a great way to use some of those older Pi's that you might have collecting dust. I have ordered several more DigiAMP+ hats and will put them on Raspberry pi 2's where I have wired network availability and Raspberry pi 3's where I need wireless connectivity. Paired with iPeng on an iPhone for control makes this an amazing solution for a whole house sound environment.
NOTE: When building a piCorePlayer node with the IQAudio DigiAMP+ there is not a specific setting in the drop down list for this hat. In Squeezelite Settings > Audio output device settings, select the IQaudIO AMP+ setting from the list.
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What is the output impedance for this amp? Is that controlled via software?
My experience has been that this card puts out very little heat of its own. The heat load will primarily be contributed from the Raspberry Pi which varies by model used. I currently have one installed on a Raspberry Pi 2 and installed in this PLA 3D printed case from Thingiverse (https://www.thingiverse.com/thing:2782115) running in a piCorePlayer Environment. Note that this enclosure has almost no ventilation and the pi/DigiAMP+ can run constantly at about 75% volume and is just perceptibly warm.
Any word on thermal handling? What's ambient idle temp? How hard can it go without fan cooling?