made a start at #86

src/en/overlay/pi-digiamp+.md

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+<!--
+---
+class: board
+type: multi
+name: "Pi-DigiAMP+"
+manufacturer: IQAudIO
+description: A combined DAC and 35w amplifier board.
+url: http://www.iqaudio.co.uk/home/9-pi-digiamp-0712411999650.html
+formfactor: 'HAT'
+pincount: 40
+eeprom: yes
+pin:
+  '15':
+    name: ID_SD
+-->
+#Pi-DigiAMP+
+
+The Pi-DigiAMP+ is an add-on board that includes a Digital to Analog Converter (DAC) and powerful 35w stereo amplifier. If you want to turn your Raspberry Pi into a working Hi Fi stereo, just add speakers and you're off.
+
+The Pi-DigiAMP+ exposes some of the Pi's pins via a header.
+
+Pin | Name | Name | Pin
+--- | --- | --- | ---
+1 | GPIO23 (Rotary encoder) | GPIO22 (Mute) | 2
+3 | GPIO24 (Rotary encoder) | GPIO25 (IR)   | 4
+5 | 5v                      | 3v3           | 6
+7 | I2C SCL1                | Ground (0v)   | 8
+9 | I2C SDA1                | Ground (0v)   | 10
+
+
+These can be used for whatever you like but some are used by some additional software the IQAudIO provide to easily support a rotary encoder for physically controlling volume, a hardware mute switch and IR control.
+
+The official documentation can be found on the [IQAudIO website](http://www.iqaudio.com/downloads/IQaudIO.pdf).