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jassing
03-01-2016, 02:47 AM
What is a good microphone to use with the audio board? I tried to search and couldn't find a reference to one. Interested mostly in speech/human voice, but not strictly limited to that...

Thanks.

PaulStoffregen
03-01-2016, 03:11 AM
The one we used in the tutorial/workshop has info here: (scroll down to "Components")

https://hackaday.io/project/8292-microcontroller-audio-workshop-had-supercon-2015

That may not be the very best mic, but it definitely works and you can hear how it sounds in the video.

rexhex
03-01-2016, 03:29 AM
im using this one. Works just fine for me. https://www.adafruit.com/products/1064

jassing
03-03-2016, 06:47 PM
Thanks to you both! I had tried one I had here but it sounded horrible, but may have been salvaged...

onehorse
03-03-2016, 06:59 PM
Have you tried digital I2S mics (https://www.tindie.com/products/onehorse/inmp441-i2s-digital-microphone/)?

jassing
03-05-2016, 03:58 PM
Hey Kris -- as a matter of fact, I put one in my cart. I figured I had some time before my other bits ship.

marnaw
03-09-2016, 01:32 PM
I soldered a electrolytic capacitor of 220uf across the 2.2uF on pin16 (between micbias and gnd )
Now i have much less noise on the audio input, so a cheap mic capsule works very good now.
martin

6610

jassing
03-09-2016, 01:46 PM
slick idea -- did you remove something too? but the way the image looks; it looks like the cap is soldered to the same smd componentwith a wire going to mic-ground. I think I get the idea; just hte picture isn't so obvious (to me).
The mic I got did have some noise, so I'm going to try this.

I'm excited to try something with my TV -- when I pute the tv, there is a noticable hum; and at high volumes, the hum is there too; so I'm hoping, with the audio board, I can adjust and adjust to get a filter of one sort or another to filter out that hum.
Where there is voice /music the hum becomes nearly unnoticable...
The teensy board/audio is got me thinking all sorts of ideas that have been bugging me...

PaulStoffregen
06-13-2016, 04:39 PM
FWIW, I tried this with several different large-value capacitors. Couldn't hear any difference in any test.