How the sound sensor module works?

Can anyone explain how this sensor works:

http://www.ebay.com/itm/380746978209?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

I cant understand, when i clap or something, shouldnt the output go to high? Here it says when there is sound its low output so im confused.

So if anyone can explain this to me and put some sort of example i would appreciate it.

P.S So i dont make 2 threads, what transistor should i use to connect the LED Strip to arduino. Im planning to make sound reactive led strip so i need something to handle strip current.

That sensor is made up of a microphone and amplifier. The signal can be either way up so there is no supprise that low means loud. You will get used to that in electronics. It is simple enough to turn it round in software.

The transistor you need depends on the current you LED strip is going to pull. You need to know that before a recommendation can be made.

Grumpy_Mike:
That sensor is made up of a microphone and amplifier. The signal can be either way up so there is no supprise that low means loud. You will get used to that in electronics. It is simple enough to turn it round in software.

The transistor you need depends on the current you LED strip is going to pull. You need to know that before a recommendation can be made.

Well i got like 4 meters of 3528 Blue strip. And i belive its sometihng like 0.35-0.4A per meter of the strip.

Well that will be 1.6 Amps then so you are better off using a FET. Something like the IRLZ44 but there are many more.

Grumpy_Mike:
Well that will be 1.6 Amps then so you are better off using a FET. Something like the IRLZ44 but there are many more.

How about the IRF-520?

And considering that sensor module. I tried testing in with multimeter, and it either always outputs 5V, or 0V (depends on how i connect multimeter leads).

So lets say when i turn it to high sens. red light is always on with 5V output. When i start lowering sens. and when light turns off, it goes to 0V. I also tuned the sens. so the light is off, and when i clap, yell or something light goes red, but no output. So im not able to trigger the sensor with some noise, its just straight output/no output all the time.

How about the IRF-520?

No you want a logic level FET, one that will turn on fully at a 5V gate signal. Look at the Drain Source resistance in the data sheet and note what it says for the gate voltage ( VGS ) For that FET it says 10V you want it to say 5V or less here.

yell or something light goes red, but no output.

The output should follow the LED, if not it is either broken or not wired up correctly.

Grumpy_Mike:

How about the IRF-520?

No you want a logic level FET, one that will turn on fully at a 5V gate signal. Look at the Drain Source resistance in the data sheet and note what it says for the gate voltage ( VGS ) For that FET it says 10V you want it to say 5V or less here.

Oh ok, so do u mind recommending few widely and commonly used, so i dont have to read thru all datasheets.

Only one i can think of is NTE2984 , Vgs = 5V, is able to handle 17A…

few widely and commonly used

Well that depends on where you are. But if you can get the NTE2984 for a good price then go with that.

Most major distributors have parametric searches you can put your requirements into. Here is one I did with the supplier I use the most:-

Grumpy_Mike:

few widely and commonly used

Well that depends on where you are. But if you can get the NTE2984 for a good price then go with that.

Most major distributors have parametric searches you can put your requirements into. Here is one I did with the supplier I use the most:-
http://uk.farnell.com/jsp/search/browse.jsp?N=2031+204245+110158844+110022506+110007555+110096399+110007508+110037447+110096769+110022473+110494042+110103811+110022468+110053033+110037435+110022501+110099572+110037408+110007573+110090194+110022471+110169481&Ns=P_PRICE_FARNELL_UK|0&Ntk=gensearch&Ntt=FET&Ntx=mode+matchallpartial&locale=en_UK&appliedparametrics=true&getResults=true&suppressRedirect=true&isRedirect=&originalQueryURL=/jsp/search/browse.jsp%3FN%3D2031%2B204245%26Ntk%3Dgensearch%26Ntt%3DFET%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26divisionLocale%3Den_UK%26catalogId%3D%26skipManufacturer%3Dfalse%26skipParametricAttributeId%3D%26prevNValues%3D2031%2B204245

Yea i think il come up with something, i just measured my strip current at 12V and it draws somewhere around 800mA.
And i figured out the sensor module.

It needs to be all the way up on sensitivity and its still somewhat weak to sense noise. So its not the best one out there but sure is good for the price.