Transformerless Power Suppply


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  1. #1
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    Quote Originally Posted by Melanie
    ... still... the great unwashed (general public) hasn't got a clue... which is why you can market complete crap and they'll still pay good money for it.
    Mel, I doubt you would risk your reputation by marketing crap just to make money.
    (please correct me if I'm wrong)
    regards

    Ralph

    _______________________________________________
    There are only 10 types of people:
    Those who understand binary, and those who don't ...
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  2. #2
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    You just have to walk down any High Street in any Town, anywhere in the world to see what I mean...

  3. #3
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    Quote Originally Posted by Melanie
    You just have to walk down any High Street in any Town, anywhere in the world to see what I mean...
    I'm almost sure I know what you mean and hope you haven't taken my comment too serious ;-)
    Last edited by NavMicroSystems; - 22nd February 2006 at 22:56.
    regards

    Ralph

    _______________________________________________
    There are only 10 types of people:
    Those who understand binary, and those who don't ...
    _______________________________________________



  4. #4
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    Default without transformer...

    Hi,

    Be carefull, be very carefull, when using a power supply without transformer is like walking in the wire without the net underneath...

    Atached you can see the circuit I use to put some power ... in PICs and other stuff. I found this circuit some years ago when I bought a kit (K6713)from Velleman, its a IR receiver to switch on/off a load connected to mains trough a relay.

    One more advise, if by any chance you are planning to use this circuit in a touch sensor or similar do not forget to use two resistors in series for the sensor, the contour voltage for a regular 1/4W is less than 200V, unless you like to get a curly hair...

    regards
    Attached Images Attached Images
    Last edited by nomada; - 23rd February 2006 at 01:39.
    nomada

  5. #5
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    If you're still looking for components, attached PIC I've taken gives you an idea of what to look for... The 11V VDR is pretty small (VDR2 in this pic) - and also laying alongside with a view of a typical Capacitor you can use. If it's an X2 type you're OK, otherwise you'll have to fit one with a 400vDC rating. It's a real good idea to absolutely and positively mark the PCB that it's LIVE... even if it's just for yourself. Some time in the future you'll forget and it'll bite you.
    Attached Images Attached Images  

  6. #6
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    Thanks Mel, I have finally got some 275V X2 caps and some VDR's (I had to buy 100 of them but thats OK). So I'll sort out a PCB (well marked, and well housed) and let you know how it goes...

  7. #7
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    Hi Melanie,

    Going back to this post,

    Would that be too much to ask for your complete fan controller schematic?
    and, if possible, for the code also?

    I am having a similar inquiry and would like to see your approach.
    Or if there is anyone else who had a similar design.

    Regards
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte

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