Re: LF: Raspberry Pi sound interface that works

[Paul Nicholson <vlf0403@abelian.org>]

Peter wrote:

> I'm running an experimental remote receiver based
> on the Wolfson/Cirrus audio deck since March 2015
> on the RPi-A+ and now RPi-3.

I waited around for a year for the drivers to get
included in Raspbian, then gave up.  Perhaps I should
have another look at it.

Thanks for the warning about the SD cards, that's something
to bear in mind.

Meanwhile, testing of the Audio Injector goes well and
I've noticed a temperature dependence of the output
phase from ebsynth, I suspect it must be the large
capacitors on either the reference input or the
signal output. What else could it be?  It's of the order
of -1 deg of phase per deg C, something like that.
Quite bad but fixable with a soldering iron I hope!

Here's the output phase as I put a lid over the RPi and
audio so it warms up for about 900 seconds, then I take
the lid off to let it cool -

 http://abelian.org/vlf/tmp/170214c.gif

At least so far, no sign of any lost samples (would
show up as a phase step).
--
Paul Nicholson
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