Without looking at this, I'm guessing it's an R-2R ladder circuit which does a very basic D/A conversion. Yes, we used this thing back in '90 or wo to make cheap devices to play MOD and SND (remember those?) way back in the DOS days. We called it the "JonBlaster" in honor of Jon Krause, who found/made the plans and built the first one. In college I used the theory of the circuit to build a control coder for a radio remote to a homebrew robot. :) Yes, the power used is tiny. And it would suffice for audio out if your wearable platform has no sound card, but does have a || port. BTW, I'm currently looking at the "Netwinder" as a wearable Linux machine. www.netwinder.org and www.corelcomputer.com Full computer capabilities all for 12VDC, 1.5 amps *peak*. ~15 Watts, typ, I believe. Check it out. Mark R. Paul McCarty <rpmc@troi.cc.rochester.edu> wrote: : I just read this fantastic article in Linux Journal(issue 53/Sept): : Driving One's Own Audio Device : By Alessandro Rubini : In which a Standalone audio driver card is built on 1.5x1.5" square, and : they give you the device driver code to drive it via /dev/audio. He : claims you can use it to generate sound up to 8KHz, which just might be
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