Measurement of sound amplitude...
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Posts: 46,084
Hi!
Here is my problem:
I would like to make a device that re-act to sound, like music. My
main problem is making a circuit that take the signal from a
microphone and amplify it. I tough about using a ADC 0831 after the
amplifier or using a /LM3904 (Not sure about # it's a chip that
convert analog sig to 10 different output step..)
Can someone help me with the microphone issue....which amplifier
should I use with it...
Any suggestion for a microphone, what type?
Here is my problem:
I would like to make a device that re-act to sound, like music. My
main problem is making a circuit that take the signal from a
microphone and amplify it. I tough about using a ADC 0831 after the
amplifier or using a /LM3904 (Not sure about # it's a chip that
convert analog sig to 10 different output step..)
Can someone help me with the microphone issue....which amplifier
should I use with it...
Any suggestion for a microphone, what type?
Comments
characteristics. What impedance is it? What is the frequency response of the
microphone? What frequency range do you want to record? The signal output
from a microphone at very low signal levels is around -50dbm. Average
conversation around -30 dbm and loud music around -10 dbm. The noise floor
is -125 dbm. Select a low noise amp chip like the National LM381and set the
gain for around 40 db. Their application note AN-64 shows the circuit
details.
The out of this ckt would then feed you A to D.
Original Message
From: "robinalmasi" <robinalmasi@y...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, December 14, 2001 8:39 AM
Subject: [noparse][[/noparse]basicstamps] Measurement of sound amplitude...
> Hi!
>
> Here is my problem:
>
> I would like to make a device that re-act to sound, like music. My
> main problem is making a circuit that take the signal from a
> microphone and amplify it. I tough about using a ADC 0831 after the
> amplifier or using a /LM3904 (Not sure about # it's a chip that
> convert analog sig to 10 different output step..)
> Can someone help me with the microphone issue....which amplifier
> should I use with it...
>
> Any suggestion for a microphone, what type?
>
>
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