Power Supply for MCU

Discussion in 'General Electronics Chat' started by bug13, Dec 14, 2012.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    [​IMG]

    Hello,

    This is my completed digital control power supply project, any feedback are welcome.

    Input: 9VAC/12VDC 1A
    Voltage Output: 750mV to 9.5V, 10mV step
    Current Limiting: 4mA to 800mA, 4mA step

    The schematic is a modified version of this one from eevblog, and I designed the PCB and wrote the software for the project.

    designed files are attached.
     
    Last edited: Dec 15, 2012
  2. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    Mmmm I was wondering if this is a boring topic and no one want to say anything.... I was intended to share and get some feedback...

    Did I do it the wrong way? :confused:
     
  3. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    You included too much information I think. Is there a question in all of this? Is it a complete project? If so I think you are going to need help with your English to make it fully understood by others.
     
  4. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Did you create the PCB yourself? If so nice work.
     
  5. SPQR

    Member

    Nov 4, 2011
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    A thing of beauty is a joy forever.
    Congratulations on your very nice work.

    I'll ask a few questions:
    1. Was the PCB a one-time purchase? How much did they charge you?
    2. Why did you use such a large heat sink? Powering a microcontroller usually doesn't take much power.
    3. I'm going through a potentiometer phase now...what kind did you use?
    4. The rest of the components look pretty standard. Did you have any that were difficult to find?

    Again, very nice work!
     
  6. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    it's pretty short now, and yes it's a completed project.
     
    Last edited: Dec 15, 2012
  7. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    thanks, yes, with Eagle CAD

    edit: Ooops, sorry I get it wrong, the PCB is manufactured by professional, I just design it in software.
     
    Last edited: Dec 15, 2012
  8. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    Thanks, always good to hear something nice :)

    1. yes it's a one time purchase, they charged $40 for 10 PCB, so now I have 9 left.
    2. I was thinking when the output is 1.8V with 800mA, (about 8W heat for the heatsink) but think again, no one need 800mA at 1.8V, silly me.
    3. I thinks it's one of those 50c to $1 one, I have a few around.
    4. they are just standard components you can buy from major supplier, I got mine from element14.

    edit: if you are referencing to potentiometer to adjust the voltage, I am using a incremental rotary encode.
     
    Last edited: Dec 15, 2012
  9. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    But did you make the PCB yourself or did you have it made?

    If you made it, How did you do the white top silk?


    Edit: Oh I see above you had them made. :)
     
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