Self driven Piezo circuit..

Discussion in 'The Projects Forum' started by pradeep_1993, Mar 15, 2016.

  1. pradeep_1993

    Thread Starter New Member

    Feb 27, 2016
    10
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    piezo red- supply
    piezo black- ground
    piezo blue- feedback
    most of the times the feedback is connected to base of the transistor...but here it is connected to emitter...
    cannot understand the configuration...
    the purple lines describe the outputs coming from timer 555 to activate the transistors Piezo Self driven.PNG
     
  2. Colin55

    Member

    Aug 27, 2015
    191
    19
    The feedback is connected to the base.
     
  3. pradeep_1993

    Thread Starter New Member

    Feb 27, 2016
    10
    0
    At first i thought so too...searched as many projects as i could..
    all seemed to connect the feedback to the base...but this was not the case in my project...
    my feedback is connected to the emitter...hence i dont know how this is working
     
  4. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,535
    1,251
    Are you sure the circuit works as drawn? The circuit and schematic had to come from someone. Can you ask that person how the circuit is supposed to operate?

    ak
     
  5. pradeep_1993

    Thread Starter New Member

    Feb 27, 2016
    10
    0
    Yes...im a 100% sure the circuit is this way...
    i am not able to contact the person...
    but id like to know how this would work...iv seen the project working...
    there must be some logic something or the other that v r skipping...
     
  6. Colin55

    Member

    Aug 27, 2015
    191
    19
    In your circuit, the feedback is connected TO THE BASE.

    How many times do I have to tell you.
     
  7. pradeep_1993

    Thread Starter New Member

    Feb 27, 2016
    10
    0
    Plz see this image...Youll need to download datasheet of WCP56 to understand whis terminals is base collector and emitter...
    the tracks are visible...im sure youll find which leads where.
    S is feedback
    R is supply
    B is ground
     
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