My first WFC/VIC

[fritz]

Hey fritz,
sounds like you're doing good work.  What chip are you using for your frequency generator?

For "tuning in" I use a pre-built DDS Generator (uses Analog Device Chip) which is capable
of 0.1 to 20MHz.

I use this clock as external clock for my attiny26 - which does 2/3 gated 1/3 pulsed fixed
so  far.
Finally the attiny should run on its own using internal rc oscillator - and has additional some
analog in´s with a/d to control the stuff in a closed loop.

Also, have you considered applying the negative voltage back-emf to the negative electrode?

What I´ve described happens with only primary connected.
If connected as VIC - there is only one pulse and one back emf per cycle.

Today I ordererd nice diodes and mosfets capable of 1500V reverse /ds voltage -
another problem are my oscilloscope probes - killed already one due to high voltage,
maybe buying some cheap ones or have to buy expensive Tek 20kv probe.....

Next time will post some scope shots (need 1.44Meg disks for my scope to export)
and a photo of my vic.

rgds.

[supermuble]

I have no formal education in electronics. Bear with me!

I've been studying the Meyer designs for about a year, but haven't tried to build one. Anyway I just built a John Bedini SSG motor which uses the back EMF spike to charge a 2nd battery. During this process, I noticed that if I placed an extra inductor coil between the 1st and 2nd battery, I get DOUBLE the voltage. If I add 2 inductors between the batteries I end up with about 30 times more voltage than I started with! I was able to start out with 50 volt spikes, and bring it all the way up to 1500 volt spikes by simply placing 2 small coils of wire in between the charging batteries.

I came up with a theory. I am new to advanced electronic circuits, and I have never studied back EMF until a few weeks ago. But here is my take on it.

The way I have my circuit I have found that between the negative inductor and the positive inductor coil, I get 1500 volts. If you notice, Stan Meyer's VIC circuit has a positive inductor and a negative inductor wound on the same core (bifilar). Well I did the same thing for my experiment, just not bifilar. I used two coils, one on the positive side of the battery and one on the negative. When I do this, I always get DOUBLE the voltage from the back EMF spike. I am NOT talking about voltage from a transformer. I am multiplying the power of the back EMF spikes by using two inductors. These inductors aren't even on the same core and I am doubling voltage.

On my Bedini motor circuit, it looks very similar to part of the Meyer VIC circuit, except that one of the inductors is being used to drive a little motor wheel. The motor wheel generates power which signals a transistor to turn the two inductors on and off! What is funny is that I am creating 1500 volts potential, but after the power goes into my batteries and comes out the other side, it almost doesn't register as more than a 2 volt spike. I am creating high voltage fields between the two inductors because the inductors are limiting current thereby multiplying the voltage spike.

The INDUCTORS are the key to the increasing voltage, obviously. Meyer said in one of his patents that if you want to increase power to the WFC, you simply add more inductors in series. As I've noticed, by adding a single extra inductor in series, I went from 925 volts to 1500 volts. This was in my own terrible experiment using two totally different mismatched inductors on air cores (not even bifilar). I can't imagine what would happen if you used like 10 inductor coils would in series.

I will begin making my Meyer VIC circuit soon. I'm going to experiment because I have a lot to learn. Perhaps you can give me some pointers if I need them!
(example diagram).


Thanks!

[fritz]

Hi !

Using inductors in series (on the same core or bifilar) is a nice way to create high voltage pulses (caused by the back-EMF).
The issue with bifilar is, that it reduces the effect of
parasitic capacity between each winding.
A "normal" (unloaded) coil has oscillating decaying back EMF - where the oscillation is between the inductance and the internal parasitic capacity. This oscillation causes losses because of the copper resistance (we dont need that).
This oscillation is reduced - additional by having both choke sides bifilar - they are "geared" by the parasitic capacity.

The first experiences I had was - that a good setup is essential - if you want to measure and optimize things.
Use good caps and ferrite beads for the power lines,
make connections as short as possible and don´t span loops -
means keep (+/-)combination of cables in close lines (or use twisted cable).

Well I got about 2kV with no WFC connected - with WFC I get up to 200V with distilled water and 60V with tap water.
-not good-

I can see a minor stepchargin effect - but it looks like I need higher energy pulses.
Additionally - the connections for the WFC are too long inside. If you want to get hard hv pulses in - you need a  matched low impedance connection here.
As Meyer is using good isolated wires from the tubes to outside - and uses adjustable negative part of choke - he matches the impedance.

Another thing is - once you discharge the EMF into the WFC - you don´t want the energy (pulse) to be sucked back - this can only be accomplished by really high inductive choke.  Another good thing is that with this high inductive - and also high resistive(some thousand windings - 11kOhm as stated somewhere) - its possible to have a high stepchargin voltage.....

I was wondering a lot how Meyer built his coils - by using very thin wire and lots of windings.
To reach 10kOhms with 0.1mm dia copper wire (1m=2.2 Ohms) -
4 kilometers
I would need 143.000 turns on 10mm dia core.........,
if you use "steel" wire with specific resistivity around 10 times higher - only 14.000 turns would be enough - 400m long wire.

This small calculations shows the importance of using resistive wire.

Maybe I´ll look for some surplus telecom relays - they
often have coils with some thousand windings - to start with.

rgds.

[fritz]

To sum it up:

You charge the field  in the core via low inductance, low resistance, primary coil. The number of turns/current/frequency should be optimized in a way that the core is energized up to its max rated flux.
In the discharge cycle (back-emf) this collapsing flux induces lots of voltage in the secondary+bifilar choke.
Due to the high parasitic coupling between upper and lower choke - and the high wire resistance - you get a low impedance pulse current towards the WFC which cannot be reflected cos of the high inductivity of the chokes.
The DC resistance of the coils is higher than the WFC self discharge resistance - which enables the step chargin effect.

hmmm.

[alan]

For "tuning in" I use a pre-built DDS Generator (uses Analog Device Chip) which is capable
of 0.1 to 20MHz.

100kHz is too fast.

I'd say go for 20kV, like meyer did. I believe ignition coils can deliver 20kV, maybe it works when you connect such a coil to a bifilar.

cool topic, good luck.