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Recent content by Warpspeed

  1. W

    Noise blanking method ?

    You say atmospherics or interference, but a very great deal depends on the nature of the "noise" and its source. Impulse interference at the lowest end of the HF spectrum, typically from remote lightning discharges, and nearby electrical sparking and arcing, have been a problem since the...
  2. W

    Need advice for my toroidal core dimensions

    What you have now should run stone cold at 2,500 watts continuous, and easily handle short term surges of multiples of that. Certainly plenty more to do, but it should be a lot less physically demanding !!
  3. W

    Need advice for my toroidal core dimensions

    Later on, if the primary starts to get a bit hot under maximum load, there appears to be plenty of space remaining to add a second primary winding to run in parallel with what you now have. Anyhow, the original purpose of this thread was winding a suitable toroidal transformer, and you have now...
  4. W

    Need advice for my toroidal core dimensions

    That sounds really odd ??
  5. W

    Need advice for my toroidal core dimensions

    Its well worth spending some time to source the ideal wire, and determining the exact length required. You will then have a very efficient transformer capable of some serious power. The design of an inverter transformer is rather different to the design of an ordinary power transformer. Even...
  6. W

    Need advice for my toroidal core dimensions

    Turns ratio stays the same, so 34 primary turns should be about right. That circles within circles calculator will tell you the largest diameter cable that you can use and still fit 34 turns through the remaining hole. Welding wire would be good because it has high temperature insulation, its...
  7. W

    Need advice for my toroidal core dimensions

    Now that the primary turns have been pretty well established, its useful to know the largest diameter wire that will fit. Optimum design for the primary is to have the same current density as for the secondary, again about four amps per mm square is suggested. If the available space allows, you...
  8. W

    Need advice for my toroidal core dimensions

    Good to see you back ! Seven watts is very low, and an EXCELLENT result, well done ! The rest of the driver electronics will also consume some continuous dc power, a few watts perhaps, but it should all end up having around twenty watts or less of idling power which is right up there with the...
  9. W

    Need advice for my toroidal core dimensions

    When the money flood dries up, reality is going to strike pretty hard.
  10. W

    Need advice for my toroidal core dimensions

    Agree, much of IT is a scam, but not all of it. Typically, senior management says, our product has a bug in it, how much is it going to cost us to fix it ? Head software guy. "I will need to employ twelve more people for six months and contract two highly priced consultants for three months"...
  11. W

    Need advice for my toroidal core dimensions

    Tough financial times ahead for many of us in the West when (not if) the US petrodollar dies. But also new opportunities should open up for some. I see the future as being able to improvise, and repair/modify/recycle older equipment to keep it running, rather than writing code. India already...
  12. W

    Need advice for my toroidal core dimensions

    You obviously know a lot more about the IT side of things than I do. No hurry on the transformer, its a MAJOR project in itself.
  13. W

    Need advice for my toroidal core dimensions

    Sine wave inverter is going to be vastly better for you in all respects. You might be able to get a VPN to bypass some of the internet issues. There must be some way around the problem, The Back Shed is a very benign and friendly Forum absolutely no reason to block it. Quite right, the...
  14. W

    Need advice for my toroidal core dimensions

    Treemon, The original purpose of this thread was to wind a suitable toroidal inverter transformer. Get that out of the way first, it will be required anyway whatever electronics you finally decide upon to drive it. I honestly think think step two might be for you to move over to The Back Shed...
  15. W

    Need advice for my toroidal core dimensions

    Three strands laid together side by side in four full layers should be possible. First layer about 80 turns of three parallel wires should fit easily onto the core (86 turns theoretically possible). Each successive layer will have slightly less available circumference. Four layers should do it...

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