Create iqaudio-pi-dac.md

src/en-GB/overlay/iqaudio-pi-dac.md

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+<!--
+---
+name: "IQaudIO Pi-DAC+"
+description: Program Arduino with Raspberry Pi SPI
+pin:
+  1:
+  2:
+  3:
+  4:
+  5:
+  6:
+  9:
+  12:
+    name: I2S
+  14:
+  16:
+    name: Rotary Encoder
+  18:
+    name: Rotary Encoder
+  25:
+  27:
+  28:
+  35:
+    name: I2S
+  38:
+    name: I2S
+  39:
+  40:
+    name: I2S
+-->
+#IQaudIO Pi-DAC+
+
+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.