Electric Adapter(power supply)

Discussion in 'The Projects Forum' started by dosyl, Sep 27, 2013.

  1. dosyl

    Thread Starter New Member

    Sep 27, 2013
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    0
    Hi guys,
    I'm new on this forum. I do electronic project not enough often.I believe what I want to ask is easy, but for me!!!!!!!!!
    I have a Brother Ptouch 1290 that use 6 batteries AAA = 9volts. Brother sell an electric adapter for close of $25.00. I'm sure that I can made it myself (but with your help).
    PTouch Electric Adapter3.jpg

    When I put a 9 volts adapter in the socket I have .87 volts at the load of Ptouch(capacitor 3300 uF. Where the voltage are gone.

    On the plan I write a Zener Diode but not sure if it is.

    The adapter 9 volts without load have close of 13.5 volts. It's written 9 volts on. When I put a 9 volts adapter nothing happen.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,154
    3,061
    Your diagram doesn't make much sense - I think the bypass around the fuse is not right?

    But anyway, I think your problem is that the load far exceeds the capacity of that adapter. Do you have any details about what your device needs and/or the rating of the adapter?
     
  3. dosyl

    Thread Starter New Member

    Sep 27, 2013
    5
    0
    Sorry for the bad design.
    The adaptor sell by Brother is a: 9 vdc. 1.6A 14.4W.
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    Just buy a regulated 9V adapter.. Should be under $10..

    Those who can't make..buy
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,154
    3,061
    So do those that can! ;)
     
  6. dosyl

    Thread Starter New Member

    Sep 27, 2013
    5
    0
    I recheck my design, and it seems good.
     
  7. dosyl

    Thread Starter New Member

    Sep 27, 2013
    5
    0
    I said that we can't put an regular adapter. Brother made his Ptouch for we buy their.
    I want help to build it not for comment to buy one.
     
  8. wayneh

    Expert

    Sep 9, 2010
    12,154
    3,061
    You don't need to buy the name brand, just any properly rated 9V adapter. In your case you need a rating of 1.6A or more. It'll cost you more to make your own unless you already have the transformer.
     
  9. dosyl

    Thread Starter New Member

    Sep 27, 2013
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    0
    Yes I have all to make it, and i have the time too. Need help only.:(
     
  10. wayneh

    Expert

    Sep 9, 2010
    12,154
    3,061
    What sort of transformer do you have - what is its output (voltage, AC or DC, and amperage rating)?

    The standard DC wall wart configuration is AC transformer-bridge rectifier-filter capacitor. This produces unregulated, rippling DC.

    For your application, I believe a voltage regulator (7809 for example) would also be a good idea. It would be nice to know if the name-brand adapter provides a regulated voltage. If so, I would say you need the regulation for sure. But it is possible the device handles voltage regulation internally. There's just no way to know without more information. Can you look at the manufacturer's adapter to get these details? Perhaps a link to it?
     
  11. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    Here is a simple powersupply made by Bill_Marsden:

    [​IMG]

    Make the 100 μF much larger, somewhere between 1500 and 3300 μF.
    And take an 78S09 or an 78T09 in place of the 7812.

    Bertus
     
    Last edited: Sep 27, 2013
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