Re: Carbon microphone amplitude

"ehsjr" <ehsjr@xxxxxxxxxxxxxxxx> wrote in message
news:mIvMf.381$dj2.321@xxxxxxxxxxx
Rune D. Jørgensen wrote:
Hi.

I'm building a microphone amplifier and filter for a communication system
for my motorcycle. I'm filtering away frequencies below 1KHz to suppress
wind noise.

I have a microphone that has a resistance of 1.8K ohm, so I guess it's a
carbon. I have read somewhere that I should have approximately 1mA
running through it. Is that correct and what kind of amplitude should I
expect out of the microphone?


If you have 1 mA current running through 1.8K ohms
resistance, you will have a voltage across the resistance
of .001 * 1800 or 1.8 volts.

As to what you read (the 1 mA) and what you guess about
the mike, who can say? We'd be guessing, based on your
guess. Facts would be helpful!


Ed, I think he's asking about the AC amplitude.

What AC amplitude is typical, for speech into a carbon mic element?


.

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