MAX4466 microphone

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mfenwick
 
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MAX4466 microphone

Post by mfenwick »

Hello, I recently purchased both the MAX 4466 and the MAX 9814. I have been able to get the 9814 working, but I think that the 4466 may be defective. How do I handle this?

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adafruit_support_bill
 
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Re: MAX4466 microphone

Post by adafruit_support_bill »

Please post photos showing your soldering and connections to the board and describe exactly the symptoms you are seeing.

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mfenwick
 
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Re: MAX4466 microphone

Post by mfenwick »

General setup
General setup
20160728_081153.jpg (147.71 KiB) Viewed 517 times
solder connections
solder connections
20160728_081145.jpg (106.93 KiB) Viewed 517 times
I have tried using this microphone with several test sketches, some that I had found on your site. This includes, but is not limited to https://learn.adafruit.com/adafruit-mic ... und-levels. I have the 9814 and it is working fine. Please help. I am getting extremely low values, the same type of values that I get when I unplug the microphone altogether.

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adafruit_support_bill
 
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Re: MAX4466 microphone

Post by adafruit_support_bill »

The soldering and connections look fine. Have you tried adjusting the gain?

Be gentle with the gain pot, it is easy to damage by turning past the stop. If I recall correctly, the gain increases by turning counter-clockwise.

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mfenwick
 
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Re: MAX4466 microphone

Post by mfenwick »

I have adjusted the gain, it seems to only move about 2/3 of a full revolution. Is that normal? Like you said, I didn't want to force it, because I know how easily potentiometers can be damaged. It just seems to be unresponsive to sound.

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Re: MAX4466 microphone

Post by adafruit_support_bill »

2/3 of a revolution is about normal for the gain pot.
We can try replacing the board. Please contact [email protected] with a link to this thread.

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mfenwick
 
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Re: MAX4466 microphone

Post by mfenwick »

Thank you for your help. I just sent them an email with the link.

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VanB
 
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Re: MAX4466 microphone

Post by VanB »

Hello
I connect the MAX4466 to Arduino uno and read out the voltage. But the voltage fluctuate very much.
How can i remove this Problem ?

kind regards Vanessa

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adafruit_support_bill
 
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Re: MAX4466 microphone

Post by adafruit_support_bill »

I connect the MAX4466 to Arduino uno and read out the voltage. But the voltage fluctuate very much.
How can i remove this Problem ?
That is not a problem. That is how microphones work. They measure sound waves which are fluctuations in air pressure. A change in pressure translates into a change in voltage.

If you want to measure the average sound level, you need to take the peak-to-peak measurement and average it over time. That is what this code does: https://learn.adafruit.com/adafruit-mic ... und-levels

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VanB
 
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Re: MAX4466 microphone

Post by VanB »

I use this code to measure the average sound level.
I use a noise generator and send a fixed frequency with 90 db.
And i think the voltage has to be stable at this high values.

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adafruit_support_bill
 
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Re: MAX4466 microphone

Post by adafruit_support_bill »

The only time the voltage will be stable is when there is no sound at all. Sound is fluctuations in pressure and that is what the microphone is measuring.

If you have a constant sound level, the average peak-to-peak measurement over time should be relatively constant. Not the raw voltage.

Post a photo of how you have everything set up - and a sample of the output from the serial monitor.

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