How can I see sound on an oscilloscope with a microphone?

[alank2]

Hi Everyone,

I'd like to see sound waves on my DS2072 from a tiny microphone I have.  Do I need to build a circuit to do this?  If so, how?

Thanks,

Alan

[dc101]

Try running the mic to the input of your computer and then the speaker output to the input of your scope.  Otherwise you could get by with a simple audio amplifier circuit.

[nctnico]

Chances are it is an electret microphone. All that needs is a bias of around 3k Ohm to 5V. The sensitivity will depend on the value of the resistor but 3k is a good start.

[alank2]

Something like this or simpler?

http://electronics.stackexchange.com/questions/36795/using-a-microphone-with-an-arduino

Thanks guys!

[EEVblog]

You don't need anything more than your scope probe:

[GreyWoolfe]

I tested a Kenwood MC-50 desk microphone just using my Hantek DSO.

[mcinque]

I guess an electret should work but since AFAIK its sensitivity is not linear you may get wrong readings: I suggest you to use a good dynamic microphone without any other use of circuitry. You should be able to read the AC variations caused by the sound that makes vibrate the microphone's membrane

[alank2]

I did get the electret to work with the circuit I posted, but I'm not so sure how well.

There are a lot of dynamic microphones at amazon for around $10 or so.  They look like they have a 1/4" jack on them.  Will this need an amplifier circuit to work?

[ju1ce]

If seeing sound is all you want to do, you can also connect a speaker to your oscilloscope and shout at it.

[Mechatrommer]

I'd like to see sound waves on my DS2072 from a tiny microphone I have.  Do I need to build a circuit to do this?  If so, how?

set the DS2072 to mV range and set the sound volume into the mic to the maxed you can, done!

[zapta]

If your probes are x10 don't use them, connects wires directly to the scope.

[MikeGyver]

Ground the pin of the electret mic with the little ground path to the case, pull up other pin to 5-12volts or whatever with a 4.7-47k resistor, and put a cap to that node, other side of cap is audio out. 3 components to use an electret condenser mic, doesn't get much easier than that.