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How to filter a microphone to pick up very low frequency?

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sanna

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hi,
I need to filter a microphone, is it possible to filter a microphone to pick up very low frequency?
Thanks
 

A.Anand Srinivasan

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Re: filters

what frequency do you want to pick up????
R u talking about picking up of frequencies below 20Hz or r u talking about picking up of frequencies upto a particular hertz...
 

sanna

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Re: filters

I am thinking to pick up heartbeats which is below 10 HZ.
 

A.Anand Srinivasan

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Re: filters

generally they are picked up using electrodes... a microphone can pick them but the signal would be very low and need a lot of amplification....

so just if you use a microphone just filter the signal using a filter which would pass your frequency of interest (10Hz)... try having the 3dB point at 10Hz...
 

flatulent

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Re: filters

Accelerometers work in your frequency range.
 

cydi

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filters

microphones are not hthe choice for your measurements
 

dineshbabumm

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filters

Placing a capacitor will be good idea.. It wil filter out sharp edges in the noise and signal.. If u want it to pick up low frequency,choose capacitor accordingly..
 

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