Re: Carbon microphone amplitude

On 2/26/06 1:50 PM, in article
Xns9776E8563A47Dblattersplatterlatte@xxxxxxxxxxxxxx, "Rune D. Jørgensen"
<RUNE_dahl@xxxxxxxxxxxxxxxxxxxxxx> 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?

I don't believe that is a carbon mike. I may not be up-to-date on them, but
in my experience carbon mikes tend to have a resistance of 200 Ohms or so.
In practice the current could be 10 milliamps, more or less, and the
resulting signal from a good quality unit might be as much as 0.5V with a
circuit voltage of about 4 to 6V.

Don

.

Relevant Pages

  • Re: Audio Tachometer for 2 stroke engine
    ... >ONLY the engine combustion pops, ... It likely doesn't need to filter out much at all. ... two stroke exhaust port to release the results of a recent explosion ... mechanical damage to the microphone. ...
    (sci.electronics.design)
  • Re: Seeking Help Developing a Crude Room Correction Algorithm
    ... being played through a speaker) and a microphone in a room, ... Look up "Adaptive Filter." ... try this in Matlab first with a short impulse response. ... room by filtering the stimulus signal so that the new IR would be "flat". ...
    (comp.dsp)
  • Re: microphone sound filter or anything?
    ... Position microphone near source of sound. ... to separate strong noise sources from the voice. ... You cannot filter out ...
    (alt.comp.hardware.pc-homebuilt)
  • Re: Newbie for audio driver
    ... I want to write a filter driver to change the data captured by Microphone. ... It's a medium-hard job as long as you ...
    (microsoft.public.development.device.drivers)
  • Re: Carbon microphone amplitude
    ... I'm building a microphone amplifier and filter for a communication system ... resistance, you will have a voltage across the resistance ... for speech into a carbon mic element? ...
    (sci.electronics.basics)