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
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.
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.
You don't need anything more than your scope probe:
I tested a Kenwood MC-50 desk microphone just using my Hantek DSO.
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
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?
If seeing sound is all you want to do, you can also connect a speaker to your oscilloscope and shout at it.
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!
If your probes are x10 don't use them, connects wires directly to the scope.
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.