Visualising output from my microphone

[Ethan25]

Hi is there any way that I can directly observe the signal variation of my earphone's microphone ? I tried to connect my probes onto the 3.5mm jack's mic and ground and hardly observed any variation (there were very small variations in mV's but Ig that was just noise).

 

[barry]

microphone output is ordinarily in the millivolt range.

 

[D.A.(Tony)Stewart]

Yes there is a way
but it depends on the datasheet and interface.

 

[barry]

when you say connected probes, I assume you meant oscilloscope probes?

 

[D.A.(Tony)Stewart]

Why can't you amplify it? or probe where it is amplified?

 

[Ethan25]

when you say connected probes, I assume you meant oscilloscope probes?

Yes

and yeah microphone's output is in mV's range but when I talk into the microphone I was not able to see any changes in my DSO.

I was under the assumption that I would be able to view the frequency output and its corresponding amplitude, was I wrong > ? or is there a better way to do this ?

--- Updated Aug 30, 2024 ---

Yes there is a way
but it depends on the datasheet and interface.

I dont have any datasheets, its just an earphone with 3.5mm jack which you get in amazon.

 

[FvM]

Bet it's an electret microphone and gives no output without DC bias voltage applied through a resistor.

 

[D.A.(Tony)Stewart]

If you have Windows, you can see your signals using an application like Audacity

You can amplify the mic signal using 12V and a pullup resistor like 4k7.