The Pi-DAC+ is a fully HAT compliant add-on accessory for the Raspberry Pi A+/B+. 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.