I have designed a small usb dac based on PCM5242. I have used TPA6120 for the headphone amplifier. The filter settings, analog gain, volume level can be adjusted using a dip switch. I have used SA9227 as the usb receiver for the dac. The power supply is based on low noise ADM7154. The usb dac is powered by a lithium ion battery source or a 5v supply. I intend to use the 20x50x80 mm aluminium enclosure for this project.
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It should cost around €75 including enclosure. I haven't thought about sales, its for my personal use but if there is a group interest, why not 🙂
Yes, I am also working on another USB DAC with headphone amp sa9227+9018q2c with LT3042 LDO which will be quite interesting as well. May be I will post the photo tomorrow.
I am interested in this DAC, with or without the enclosure (I personally would not need it, as I will just solder the DAC right next to my amp).
One suggestion: from my past modification of PCM5102A-based DACs, the Analog Input Voltage benefits from slightly elevated voltage, in the neighborhood of 3.5v to 3.6v (the max tolerable is 3.9v, which should not be used). I believe this view was shared by some others as well, as I remember reading another diy-er who was supplying 3.5v to the analog section.
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