The inductors are the most mysterious part of this circuit for me.  TTL was being invented when I was learning electronics, and as a result my understanding of radio electronics is very weak compared to digital electronic application.  So to make up for my shortcoming, I’m overdoing it.  I’m buying a lot of ferrite coil cores in various physical forms: I have a few rods, a few toroids, an E-core, some dielectric tape, and a lot of magnet wire.  I’m also buying a pre-wrapped coil to try, Digi-key has a few that looked interesting and were cost competitive with the raw unwrapped ferrites.

The E-core seems to have the most potential for a Voltage Intensifier Circuit (VIC) transformer in that it is much easier to wrap.  It has a plastic bobbin that can be wrapped on a jig, then the core snapped into place around it.  Rods are easy to jig too, but toroids, which would seem to be the best design, are of course the hardest.  It’s going to take me a long time to wrap a 4 inch toroid with 200 windings of 20 gauge, followed by as many wraps of 28 gauge as can be handled, but at least 600 per the Meyer patent.  I’ve barely started, with this toroid I want to make a 5 winding setup.  I might try the E-core with these same gauges, but only as a VIC transformer without the chokes.

Inductor junction boxI wrapped a 3/8 inch diameter 4 inch long type 33 rod with dual strands of #22 wire, that one is pictured here.  It measured 190 uH (microhenries) per side.  1.75 mH per side bifilar coilI just wrapped a 1/2 inch diameter 7.5 inch long type 33 rod with two strands of #24 wire, that came out to be 1.75 mH (millihenries) per side, almost a tenfold increase.  That coil I taped and wired into the inductor junction box, and draws 9 mA (milliamps) current across a 4.7K resistor load when using wide open DC (no pulse) from the Lawton circuit.  The waveform is extremely clean on the scope, it’s impressive.  If I unhook everything and measure the inductance with a meter across both sides of the coil, it shows 7.0 mH (milliHenries), which might suggest something if I knew enough about it :-)

Some two-winding chokes from Digikey04-AUG-2008 I got a couple of store-bought chokes from Digi-key today.  I’ve measured them with my cheap meter, they are surprising.  Here, I thought I was cool wrapping my own rod coil, these store bought suckers put me to shame.  Of course, none have been given trial by fire yet, so we shall see.  I’ll list them by rating, what I measured per side, and what I measured with them hooked up serially in differential mode (crossed over).  In common mode, the inductance cancels itself out and it measures zero.

Digikey M8911-ND (toroidal, above) $11.97 rated 50mH, 2.3A measured 69.7mH / side differential 276mH
Digikey 495-2790-ND (D-core, below) $3.74 rated 50mH, 1.3A measured 43.4mH / side differential 172mH

Right now, if the chokes were working or not working I wouldn’t know the difference. But soon I’ll get to hook these up and find out.

I also just hooked up a neon sign transformer.  It’s not in the circuit properly, I’m just pumping the pulse through it, but it’s putting out a LOT of voltage.  Neither of my meters will show the voltage, and with no load, it goes off the scope at 400 volts AC.  With the 4.7K resistor as load, it’s more manageable, and it sings the pulse frequency quite audibly without a speaker attached.  I will have to hook it up properly, I think it’s going to work.  It’s kind of scary.

4 Responses to “WFC Inductors”
  1. Saw this today…do you believe it?

  2. Yes. I also know what people who know this technology say about web sites like this. I believe they’re trying to rip you off. Try instead, it will show you how to make a booster that actually works. There’s no miracle here, and if you think that a fuel injected ECM equipped oxygen sensored car can work without modification, you definitely need to do more reading:

  3. Where are you getting your ferrite cores. A friend of mine and myself are having difficulty finding the cores yet so many people working on WFC’s have them.


  4. Unfortunately, I’m better at buying them than I am at winding them. Despite buying a lot of toroids, I haven’t used any of them yet.

    Digi-key at has some store bought transformers and chokes that I’m trying. I’m trying a Triad VPS10-8000 power transformer for the VIC step-up, and a Bourns 8116-RC dual coil choke.

    I got a few rods and toroids from Amidon at . They have 1/2″ rods, and some toroids made for “pulse transformers”. They sell some E-cores with bobbins that look interesting.

    I bought some very interesting C-cores, they are made by Metglas at and I got them from Elna Magentics at , they are called “POWERLITE C-Cores”. I might add that the person I spoke with on the telephone was very pleasant. These are matching nanocrystalline amorphous C-cores (ends together they make a loop) used by Bearden and Naudin for “Motionless Electromagnetic Generator” circuits. I’m going to be making a jig to wind these with a power drill. I’m currently taping, painting, and making Teflon coil supports for these.

    I also got some rods, wire, tape, and toroids from CWS Bytemark at .

    Check into stuff called “Super Corona Dope” as an insulator varnish. Lots of places sell magnet wire, also look for “Scotch-92” dielectric tape.

    I hope this helps!

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