sound activated circuit

Discussion in 'The Projects Forum' started by Morgan Rhind, Nov 21, 2008.

  1. Morgan Rhind

    Thread Starter New Member

    Nov 21, 2008
    3
    0
    hi guys and girls, im very new to electronics i only have minor experiance with it.

    i would like some suggestions, this is what i need the circuit to do.

    circuit must switch on with nois
    switch off when nois stops
    must be as small as possible(but big enough to make)
    components must be available from local electronic store.
    power supply is a 6cell AA battery pack
    circuit runs a race motor

    the application of this circuit is in a paintball loader(hopper)
    the motor currently runs continuously which is noisy and draws alot of power.
    i would truly appreciate any input or links to websites that could help.
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You can amplify the signal out of a microphone, then use a rectifier to convert it to DC and then detect this DC value with a transistor which will drive your motor (with a relay if needed).
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Then the microphone hears the noisy motor and it keeps going forever.
     
  5. Morgan Rhind

    Thread Starter New Member

    Nov 21, 2008
    3
    0
    thank you ill take a look at those circuit boards.
     
  6. Morgan Rhind

    Thread Starter New Member

    Nov 21, 2008
    3
    0
    my consern at this stage is that it must turn off when there is no sound.
     
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