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Need help reading schematic

Discussion in 'Electronic Design' started by [email protected], Jan 11, 2005.

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  1. Guest

    I found a pretty neat design at
    http://www.pskovinfo.ru/coilgun/indexe.htm and the circuit diagram is
    on http://www.pskovinfo.ru/coilgun/vcircuit.gif

    The descriptions can be found on other pages.

    I decided I wanted to build it, and did a lot of research finding out
    what the values are for certain components and finding equivalent
    components on Newark, but he left out the description of the diode
    KD510. As far as I can tell, the only place that diode KD510 is
    mentioned, in all of the WWW, is on his webpage.

    Then he forgot to describe the transformer on the DC/DC unit.

    I'm not an EE, I'm only a tech and hobbyist, so maybe someone can help
    me?

    Jason
     
  2. Guest

    Oh, for those who are interested.

    KD212 is equivalent to Newark part 33C1016
    KC482A is equivalent to Newark part 16F6180
    FR207 is equivalent to Newark part 26C2837
    T122-25-12 is equivalent to Newark part 48F1271
    D122-25-14 is equivalent to Newark part 26C2837

    Jason
     
  3. Why's that, John? Is it simply the fact that there are 18^120 of them
    in existence?
     
  4. Guest

    To be fair, since the designer said "KD510 any small impulse diode".
    So that suggestion should probably work. It's the coils that are the
    real bugger.

    He describes the main transformer as "I use ferrit drossel (usually
    from any small DC motors filter). This drossel has one-layer coil and
    ferrit pipe core with two axial pin. I turned second one-layer coil.
    The turns ratios per side are one to one."

    The main inductor is described as "Main coil has 310-320 turns wire
    diameter 2 x 0.6 mm (one 0.85mm or pair 0.6mm). I have many 0.6mm wire
    and use pair instead of 0.85mm." It should be noted there's a hole
    through the center of the main inductor coil.

    The sensor coil is described as "Sensor has 3 layer wire diameter
    0.1mm. Sensor has ferrit core diameter 2.5 mm length 10 mm."

    The DC/DC Unit transformer is describes as "The transformer in the
    DC/DC converter has ferrite caps core one inch diameter. First coil
    has 10 turn of 0.6 mm wire and second coil has 400 turns of 1.5 mm
    wire. Ferrite caps core has small non magnetic clearance (about
    0.1mm)."

    Now, I scanned Allied Electronics and Newark, and none of them describe
    their transformers or inductors that way.

    Jason
     
  5. Tim Wescott

    Tim Wescott Guest

    Transformers in switching supplies are often custom-made for the supply.
    What he's describing is hand-winding his transformers on ferrite
    cores. It sounds like he did it b'guess and b'gosh from surplus
    ferrites. Either the application isn't critical, or he got lucky, or
    there's a lot of experimentation there he didn't tell you about.

    So what you need to do is figure out how to replicate his performance.
    Chances are if you can get the dimensions of the cores he used you can
    take a wild guess about material and hope you're right.

    Not knowing what is commonly used for DC motor filtering in Russia I'd
    say try 77 or 75 mix from Amidon -- http://www.amidoncorp.com. If it
    were me I'd do some analysis and/or simulation on the circuit & design
    the transformers from there.
     
  6. Tam/WB2TT

    Tam/WB2TT Guest

    He is telling you how he made the transformer. You can't buy these things.

    Tam
     
  7. The author is describing how you should manufacture the coils,
    yourself.
     
  8. Guest

    I was hoping to avoid that unless absolutely necessary. It seems to be
    absolutely necessary if I want to build this.

    Oh well, I'll build these, and then measure them, and then find
    something at Newark with the same specs.

    Jason
     
  9. Rich Grise

    Rich Grise Guest

    Are you developing something for production? Because if I had built a
    coil, and got it working, I'd call it a day, so to speak.

    Thanks,
    Rich
     
  10. Guest

    I have 5 family members who want one if I can get mine working. I have
    no desire to wind that many coils.

    Jason
     
  11. jake ACG rep

    jake ACG rep Guest

    That coil you are trying to replicate is an experimental coil. You
    ought to try altering it to get best performance for your cap and
    projectile arrangement. Us it as a baseline then vary the windings as
    necessary. This is no quick fix pill. This is scientific
    experimentation.
     
  12. jake ACG rep

    jake ACG rep Guest

    That coil you are trying to replicate is an experimental coil. You
    ought to try altering it to get best performance for your cap and
    projectile arrangement. Us it as a baseline then vary the windings as
    necessary. This is no quick fix pill. This is scientific
    experimentation.
     
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