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Development Kit Microphone Input Capture

Added by Tay Barrett over 1 year ago

Hi,
I am working with the AM57x Development Kit with the MitySom-AM57x SOM.
I require microphone capture from the line input and have attempted adjusting amixer settings according to the Wiki and have had no luck in capturing microphone level input.
Is there some form of external amp/preamp or hardware solution on the board I can use to achieve microphone capture?

Thanks


Replies (5)

RE: Development Kit Microphone Input Capture - Added by Jonathan Cormier over 1 year ago

The 57x devkit audio input was hooked up as a Line Input. See the snippet from the datasheet.

According to the TLV320AIC3104 datasheet, to support a mic in, it should be hooked up like

If you wanted to mod the devkit, it looks like you could remove R227 and add a resistor from the same pin to the MICBIAS.

RE: Development Kit Microphone Input Capture - Added by Jonathan Cormier over 1 year ago

Scratch that, the input is connected to Line2 and is set up for Stereo input so the datasheet example I included above doesn't apply. I added a section to the wiki to modify the board for microphone in. Please let me know if you try it and if any additional modifications are necessary.

https://support.criticallink.com/redmine/projects/mitysom_am57x/wiki/Example_audio_line#Mic-In

RE: Development Kit Microphone Input Capture - Added by Tay Barrett over 1 year ago

Hi Mike,

Thanks for replying. I will check that functionality as soon as I can and will let you know if there are any issues.
In the mean time do you have any advice on powering a headset/microphone that requires phantom power?

RE: Development Kit Microphone Input Capture - Added by Jonathan Cormier over 1 year ago

Tay Barrett wrote in RE: Development Kit Microphone Input Capture:

Hi Mike,

Thanks for replying. I will check that functionality as soon as I can and will let you know if there are any issues.
In the mean time do you have any advice on powering a headset/microphone that requires phantom power?

I don't think we've dealt with phantom-powered mics before. I'd guess you could use something like this, https://www.amazon.com/Neewer-1-Channel-Microphone-Condenser-Recording/dp/B014H8AWGC for development. And google has many results on what a phantom power supply schematic would look like for a final design.

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