Ideas for a project

Discussion in 'The Projects Forum' started by lynad, Jan 2, 2013.

  1. lynad

    Thread Starter New Member

    Jan 2, 2013
    6
    0
    Hi Everyone
    I want to start a mini project but i am out of ideas, can anyone help me or give me the necessary pointers.Thanks
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
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    What area are you wanting to go into?
     
  3. lynad

    Thread Starter New Member

    Jan 2, 2013
    6
    0
    i want to go into rectifying
     
  4. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
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    seems easy enough...how about building this, but build the rectifier instead of buying it...
     
  5. lynad

    Thread Starter New Member

    Jan 2, 2013
    6
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    thanks, i will surely check this out. am still welcome to more ideas.
     
  6. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    You mean like A/C to D/C rectifying? Or do you mean RF envelope detection? Or something else?
     
  7. lynad

    Thread Starter New Member

    Jan 2, 2013
    6
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    i mean ac to dc rectifying
     
  8. Brownout

    Well-Known Member

    Jan 10, 2012
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    Try making a variable power supply. The internet is full of schematics/project details.
     
  9. lynad

    Thread Starter New Member

    Jan 2, 2013
    6
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    Do you have any other Idea?
     
  10. abhaymv

    Active Member

    Aug 6, 2011
    104
    4
    How about building a constant current supply from AC input? I'm working on something similar, but you can find another way to do it. You may make the current output adjustable.:cool:
     
  11. lynad

    Thread Starter New Member

    Jan 2, 2013
    6
    0
    OK, this looks interesting, how can i get started?
     
  12. MKCheruvu

    Member

    Nov 20, 2012
    30
    6
    You can think of AC Constant Current Source
     
  13. abhaymv

    Active Member

    Aug 6, 2011
    104
    4
    In my miniproject, I'm using four constant current supplies. See the thread LED based sun simulator started by me in this forum for details. :D
    This is the schematic:
    http://forum.allaboutcircuits.com/attachment.php?attachmentid=50401&d=1357152795

    It uses the LM317 voltage regulator as a current source. This is because the voltage between pins 2 and 3 of the regulator will always be 1.25V for the IC's range of inputs (2V to 37V usually, see the datasheet).

    The constant current supply is achieved by simply placing a resistor R between the terminals. So constant current, I=1.25Volts/R.
    This is simple, but you can change this to get an adjustable supply. You may use switched resistors, or a pot for continuous variation. Keep in mind that accuracy is important. For high voltage drop across the LM317, the IC needs a heat sink. You can make suitable modifications to this as well. Based on current range, you'll have to select the transformer, the diodes for the rectifier etc. Filtering is also important here, large ripples can cause problems.
     
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