I've made some major changes to the circuit. In addition to its primary function as a USB to S/PDIF converter, it can be built up to create a battery-powered headphone amp. The amp input can be switched between USB or analog (e.g. an MP3 player). The Li-ion battery is switched up to +/- 5V to run the parallelled opamps that drive the headphones, and is charged from the USB power.
The PCB was laid out to fit directly into a Hammond 1457K1201 enclosure.
Hello Paul,
You may want to look at the attached Web site... USB DAC w/ I2S output plus other frills.
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..not my unusual typing!!
Louis
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