from DAC to sound sensor

Discussion in 'Embedded Systems and Microcontrollers' started by moslem, Feb 4, 2010.

  1. moslem

    Thread Starter New Member

    Dec 16, 2009
    hello everyone
    i want to know how to connect DAC to sound sensor i knew that i must put attenuator and low pass filter before that sound sensor please i want any details and the hierarchy of the blocks
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    I am going to guess you mean speaker for "sound sensor". A speaker is meant to make sound. A sensor responds to it.

    A DAC usually has a low output. It needs to be low pass filtered and then amplified before you get sound out of a speaker.

    Blocks go like:

    1. DAC
    2. Low pass filter
    3. Attenuator (volume control)
    4. Amplifier
    5. Speaker
  3. moslem

    Thread Starter New Member

    Dec 16, 2009
    thanks alot but why we use amplifier after attenuator ana i knew that the speaker receives asmall signal in the mv range?
  4. Markd77

    Senior Member

    Sep 7, 2009
    Amplifier goes after attenuator because otherwise the amplifier would have to be more powerful and then waste a lot of the power in the attenuator.
    Headphones may be in the mV range but loudspeakers may require 10s of volts.
    Can I just check if you are trying to output a sound or to measure one - you mention DAC and sensor which are contradictory.