[sdiy] Digital audio demo on Youtube

[Neil Johnson]

> The output stage of the Roland R8 kind of approximates a Pulse
> Amplitude Modulated output, with a single PCM54 DAC feeding eight
> 4th-order (-24dB/oct) low-pass filters through 74HC4051 demuxers.
> That's better than a ZOH, since each output gets a short pulse in
> round-robin fashion.

-3dB is around 15.6kHz.

Neil
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http://www.njohnson.co.uk