need circuit Explanation

Discussion in 'General Electronics Chat' started by cellage, Jan 29, 2011.

  1. cellage

    Thread Starter New Member

    Oct 18, 2010
    14
    0
    can Anyone explain this circuit to me what each component do ?
    assuming there is a microphone in place of the buzzer
    and assuming that the transistor is 2N3904




    [​IMG]
     
    Last edited: Jan 29, 2011
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Somehow, all of the forward slashes were removed from your link to the schematic.

    [​IMG]

    This looks like a homework assignment. Is it?
     
  3. cellage

    Thread Starter New Member

    Oct 18, 2010
    14
    0
    No i just used this circuit as a sub circuit in a project I made I found the output suitable and focused on the programing schema and now i need to understand more thing about this circuit ..
     
  4. cellage

    Thread Starter New Member

    Oct 18, 2010
    14
    0
    here is the circuit
     
  5. cellage

    Thread Starter New Member

    Oct 18, 2010
    14
    0
    the question is resolved
     
  6. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Common emitter amplifier for a knock/sound sensor, or similar purpose.
     
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The original schematic is WRONG. It uses a piezo buzzer that has an oscillator inside that shorts the base of the transistor to ground.
    Instead it should use a piezo transducer that works as a microphone and does not conduct electricity.

    If you use a dynamic mic (coil and magnet) then it will also short the base voltage of the transistor to ground. If you use an electret mic then the DC supply voltage for it will be too low for it to work.
     
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