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Q: pins on flyback transformers

Discussion in 'Electronic Basics' started by Dominic-Luc Webb, Jan 4, 2005.

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  1. I was about to toss out some old computer monitors, but thought to pull
    the flyback transformers for use in some of my high voltage projects.
    Question: Is there some simple trick to determine which pins are which?
    Maybe there is somewhere online that posts pinouts for more common
    flybacks found in more common monitors and TVs?

    Also, maybe someone knows some cute trick to removing them from the
    circuit board? There's a lot of pins and they are soldered in pretty
    securely.

    Dominic
     
  2. Trace the circuit before you remove the tranformers. You should be
    able to extract the key pins that way, and all of it if you want to
    expend the time. Sometimes when tracing it helps to have a sample
    schematic, so you have a general idea of what you will be looking at.
    Figure out the driving circuit, indeed you may want to extract some of
    the driving circuit as parts, and the rest sort of falls into place (or you
    may not even care about since there'll be various lower voltage windings
    you don't care about).

    Micahel
     
  3. Andrew Holme

    Andrew Holme Guest

    You can identify windings by checking for continuity using a multimeter.

    If you have a signal generator and a 'scope, you can estimate turns ratios
    by injecting a small test signal; if not, I would say the OP has the best
    idea. The wire guage may also give you a clue: the high-voltage winding is
    probably finer wire.
    I prefer de-soldering wick e.g. Servisol Soldamop. It just soaks up all the
    solder like magic leaving the area completely clean except for a very thin
    tinning.
     

  4. Thanks for suggestions and they certainly make sense to me. I am actually
    a bit knew to electronics, but have university education. May I ask how
    to safely access this section of the board and if you have suggested
    books or, even better, online reading that specifies how to safely access
    the high voltage section? I suspect there are some commonly understood
    ways to go about this.

    Dominic
     
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