• Audio

  • Microphone to Speaker

Hi! I'm a total newbie and I'm looking to use the audioIn and audioOut to take input from a microphone and play that audio back through my headphones. Can anyone point me in the right direction please? Thank you!

You should be able to plug any microphone that does not require phantom power into the audio input. You may need an adapter from whatever connector your microphone uses to the 3.5mm female jack that's on the audio connector we provide. This 3.5mm connector is stereo, so you probably want to connect your microphone to one of the two channels only.
Then load the "passthrough" example project in the IDE. You probably need to increase the gain on that specific channel before you start it, so browse to the "Project settings" tab and set the PGA (Programmable Gain Amplifier) on that channel to somewhere between 30 and 40. Then start the program. If the sound is too quiet, try increasing the gain (maximum is 59.5), otherwise if your sound is distorted, try decreasing the gain.
You need to restart the running program before the change to gain is applied.

    2 months later

    Is the Bela Cape able to supply plug-in power through the audio input (for example for a gaming headset with electret gooseneck mic?

    Looks like Pin 15 on the TLV320AIC3104 can output a mic bias voltage?

    Oh well surely my previous statement was BIASed by the fact that a search in the pdf for "plug" did not return any result.

    Unfortunately from the cape schematics it looks like pin 15 is not connected 🙁 .

    a year later

    B2 actually. Boards shipping from tomorrow will have the micbias broken out to an unpopulated through-hole pad.

    6 years later

    giuliomoro Hi, I am also new to this, and I got a mic as shown in the picture, so the one I got will require phantom power and not applicable to what you said above right ?

    Also, are the mic not needing phantom power usually much bigger than the one I have atm ?

    Thanks in advance

      I doubt this requires phantom power. It may require plug-in power (2.5V) perhaps and a custom cable. Do you have any documentation on it?