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Old 1st March 2014, 10:10 AM   #1
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Default lm386 speech amplification and filter circuit

I am using lm386 for signal amplification recievied from microphone and then send them to analog pin of arduino..do i need a speech filter circuit also between lm386 and arduino or lm386 would limit the frequency response to 300-3400hz (the speech audio spectrum range)??....
{ basically i am trying to make a audio recorder..the arduino will store the data in a wav file and transfer it to sd-card for playback }..
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Old 1st March 2014, 12:59 PM   #2
frank1 is offline frank1  United Kingdom
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Quote:
Originally Posted by mayank199325 View Post
I am using lm386 for signal amplification recievied from microphone and then send them to analog pin of arduino..do i need a speech filter circuit also between lm386 and arduino or lm386 would limit the frequency response to 300-3400hz (the speech audio spectrum range)??....
{ basically i am trying to make a audio recorder..the arduino will store the data in a wav file and transfer it to sd-card for playback }..
The LM386 is a small power amp. It will be very noisy used as a Mic amp.
As with any A-D conversion, you will need a LP filter to prevent aliasing.
Frank.
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