‫Welcome to the microphone interface lab set up for this lab you will meet we'll be using the electronic
‫break or a microphone breakout board from out of fruit.
‫And this breakout board has three different pins on it.
‫We've got an out which is the analog output signal that the microphone emits based upon waves that we
‫send into the microphone.
‫And this is the the pen that you're going to want to plug into the analog input on your Veltman board.
‫You also have the ground which is just tied to ground.
‫And we have the VCC where this microphone can handle from 2.4 to five point five volts.
‫However note that your FPGA can most likely only handle 3.3 volts.
‫So don't put 5.5 volts into the VCC only put 3.3 volts or whatever logic level you're powering your
‫FPGA at.
‫And another thing to note about the microphone it is when it's output it's DC biased.
‫So whatever your Vcc is divided by two is what the microphone will output when there's no sound.
‫So for example if you put 3.3 volts in there you'll see approximately 1.6 5 volts when nobody's talking
‫or there's no sound being being played into the microphone.
‫You'll see approximately one point sixty five volts steady dc coming out of the microphone.
‫And then as you talk it'll be adjusted to the signal amplify and go up based on that.
‫And so and that is for all the development boards and other developed boards I'm using have a microphone
‫on them.
‫And so this is the one that we're using for all the demonstration business course and this is the this
‫is the lab set up for the microphone interface.