help with my rectifier to two smaller circuits

Discussion in 'The Projects Forum' started by keithisdoped, Aug 26, 2011.

  1. keithisdoped

    Thread Starter New Member

    Aug 22, 2011
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    [​IMG]
    hi in this schematics you can see i have made a dice game , a buzzer and a rectifier. i designed the dice and buzzer separately from the rectifier.
    after the designs were done i tried combining the rectifier to the dice and buzzer circuit but every time i trial run it, the rectifier blows in multisim , what am i missing? or what have i done wrong? anyway the 5MR is there to decrease the 9v to 5ish V for the 4017 ic.

    this is my final year project and requirement of 3 different circuits thus the separation of lot's of things.
    i would really appreciate the help! thanks geniuses :D
     
  2. ian123

    Member

    Aug 24, 2011
    73
    2
    Are you saying the rectifiers D7 to D10 blow up
     
  3. keithisdoped

    Thread Starter New Member

    Aug 22, 2011
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    [​IMG]

    oops i meant transformer damn sorry it's like 2am here and i'm rushing through my project...
     
  4. ian123

    Member

    Aug 24, 2011
    73
    2
    So the transformer blows up
     
  5. ian123

    Member

    Aug 24, 2011
    73
    2
    or the fuse blows
     
  6. keithisdoped

    Thread Starter New Member

    Aug 22, 2011
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    the fuse stays but the transformer blows like in the pic.. the output of transformer is gone lol.
     
  7. ian123

    Member

    Aug 24, 2011
    73
    2
    possibly the transformer is connected the wrong way ie: secondary on mains side. the rest of the circuit is ok
     
  8. ian123

    Member

    Aug 24, 2011
    73
    2
    C4 should be a little lower 0.1 uf like C5
     
  9. keithisdoped

    Thread Starter New Member

    Aug 22, 2011
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    it was initially suppose to be 0.33uF but i bought 0.33F without looking and so i thought the nearest to 0.33uF was 1uF which i had extra thus soldering it in haha.. anyway i just changed C4 value doesn't seem to do a difference..

    nah it's connected correctly because when i remove the rest of the circuit , the rectifier works...
     
  10. ian123

    Member

    Aug 24, 2011
    73
    2
    No it wont C4 and C5 are for transients and is recommended by the manufacturer.

    apart from that i dont see anything wrong with your circuit.

    if you want you could simulate just the rectifier circut thn see if the transfomer blows
     
  11. ian123

    Member

    Aug 24, 2011
    73
    2
    Sorry beats me everything looks good
     
  12. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    If it is actually a 0.33 Farad capacitor, then it is VERY large. It may have a low voltage rating. If the voltage rating on the 0.33F cap is low, it will look like a short to the transformer output.
     
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