Arduino Forum

Using Arduino => Audio => Topic started by: VishwaPinnawala on Jul 21, 2019, 10:43 am

Title: Microphone sensor problems low gain???
Post by: VishwaPinnawala on Jul 21, 2019, 10:43 am
hey anyone having issues with microphone sensors that they don't get sound from distance and only when u tap it with fingers
Title: Re: Microphone sensor problems low gain???
Post by: Grumpy_Mike on Jul 21, 2019, 04:30 pm
Yes they all work like that.
More gain means they can make sense of the weaker sounds.
Title: Re: Microphone sensor problems low gain???
Post by: DVDdoug on Jul 21, 2019, 06:06 pm
Some microphone boards a gain control pot or you can change the gain resistors or build your own preamp.   

Or, you can buy an audio mixer (they all have gain/level controls) and a microphone.   Of course you'll have to bias the output.   And, you'll need a regular stage/studio microphone.   "Computer microphones" don't work with mixers or PA systems, etc.

I have one of these (https://www.sparkfun.com/products/12758) and I agree.   The sensitivity is a little low.    For example, I have to crank-up the TV louder than I normally listen to get a "good signal".    But there is some logic in that...    It doesn't have variable gain so it can be overloaded (and clip/distort) and lower gain gives more headroom.   Also, higher gain means more noise pickup/amplification (both electrical and acoustical)