[AudioI] Spec Sheet

[David Riedstra]

Thanks Ron. Might be a combination of 3rd-party wall wart adapter plus weak wifi signal. Anyway, not a huge issue.

Dave

On Fri, 2021-03-26 at 16:30 +0000, Ron Patton via People wrote:

Hello David,

I have no problems with SSH sessions while the AudioInjector is playing audio.  Be sure you power supply is beefy enough to handle the power requirements of the RPi and the AudioInjector.

73,

Ron / W4MMP

On 3/25/2021 21:37, David Riedstra via People wrote:
Thanks Matt & Robert, these CODEC specs look handy.

I'm primarily interested in the impedance of the RCA inputs because I'm using the Stereo with a raspberry pi 3b with piezo contact mics (and might do with the Octo as well) so impedance matching is a concern. (I've built some JFET buffers according to this design which seem to work well enough: http://www.scotthelmke.com/Mint-box-buffer.html.)<http://www.scotthelmke.com/Mint-box-buffer.html> I've addressed the output power issue by using some small class-D amp chips from Adafruit.

Another question I have: does anyone else experience a power hit to the RPi when the AudioInjector hat is playing audio? My SSH sessions over wireless stall while audio is playing through the hat, which makes me think that it's drawing power away from the wifi card. (Wired connections are fine.) I haven't had that with the other hat that I've used. Is this just a fact of life with these chips or is there a way to mitigate it?

Thanks!

On Thu, 2021-03-25 at 20:54 +1100, Matt via People wrote:


Add to Robert's list below the following ...

For the Isolated and Pro soundcards : https://www.cirrus.com/products/cs4272/

I can give you more information on the impedances for the various connections if you let me know which product you are targeting.

Matt


On 25/3/21 6:07 pm, Robert Bielik via People wrote:
The horses mouth here is the datasheets for the CODEC chips the stereo and octo cards use:

Stereo: https://master-nq.webp2.cirrus.com/products/wm8731/
Octo: https://www.cirrus.com/products/cs42448/


From: People <people-bounces at lists.audioinjector.net><mailto:people-bounces at lists.audioinjector.net> On Behalf Of David Riedstra via People
Sent: Wednesday, 24 March 2021 15:03
To: people at lists.audioinjector.net<mailto:people at lists.audioinjector.net>
Subject: [AudioI] Spec Sheet

Hi all,

Is there a spec sheet for the AudioInjector hats? I'm using a Stereo and am interested in the Octo for another project. I'm looking for a single reference for information about things like input & output impedance and output power.

Thanks,
Dave
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