Circuitry Design Group


Circuitry Design Group

Website: http://www.falstad.com/circuit/
Location: World wide
Members: 35
Latest Activity: Jul 14, 2014

Discussion Forum

Mosfet driver

Started by James Morehead. Last reply by John Dec 14, 2011. 16 Replies


Started by James Morehead. Last reply by James Morehead Jan 12, 2011. 1 Reply

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Comment by Ben on March 28, 2012 at 3:15am

Thanks James for the support.  I will go to my local electronics shop and see what I can get in a way of  large non polarized capacitor.

That web site at first look seems daunting for a novice but I am sure I'l get what I need.

Thanks again for the help

Comment by James Morehead on March 27, 2012 at 4:25pm

For testing without an HHO cell, add a large non-polarized capacitor in place of he cell. Without a cap of some sort, the circuit will not work.  It would not need to be of high quality as the actual capacitance would not matter too much, but you would want it to be higher voltage (at least 10x input voltage) and as large of a capacitance as you can get.  A large capacitance would lower the resonating frequency, making tuning easier.

That circuit was the first one I built as I started tinkering with HHO.  The double gated 555 timer circuit has become a staple on my test bench.  I have found the output circuit a little lacking, and have such modified it a bit, but it is good for what it is designed for.

The coil design and building suggestions are a little....simplistic.  The coil needs to be designed around the capacitance of the cell to which is going to be attached, as well as the desired operating frequency range.  For design work, I've found Coilcraft's toolbox handy:


Oh, and on a side note, if you use an automotive ignition coil to drive an HHO cell, you will develop some very odd behavior.  The output voltage from the coil will increase until it can reach a breakover voltage, at which point current starts to flow, then the voltage will drop off dramatically.  For high voltage, I have found using a tesla coil to be much fun and very promising.

Comment by Ben on March 26, 2012 at 7:18pm

Thank you James.  Because I was just bench testing without the HHO generator, I was measureing the voltage with a volt meater and had the same voltage as with no coil.  Is it because I was not connected to the HHO device that the lack of capacitor effect of the HHO device did not give me the increase in voltage that I wanted.  

The David Lawton circuit kit I am using is from http://www.courtiestown.co.uk/ and I was following the instructions for the bifillier coil  from page 38 of


Does the coil have to be wound differently to what is suggested here?

Comment by James Morehead on March 26, 2012 at 8:25am

While using Lawton's double gated 555 driver to drive an automotive ignition coil can work, it would not server the exact same purpose as the bifiller coil.  An automotive ignition coil creates high voltage when the stored magnetic field is forced through the secondary windings of the coil (very simplified, but you get the idea).

The bi-filler coil in Lawton's papers was derived from Stan Meyer's patents.  The coil was to act as a bi-directional storage device and electrical coupler.  Energy would be sent to the coil, but rather than back to the source when the source is turned off, it passes on through the second winding and into the HHO cell.  The HHO cell just acts like a capacitor, storing this energy.  Once all of the energy from the coil passes into the capacitor, it cycles back into the inductor.  When the inductor is fully charged, you want another pulse of energy from the power supply.   This puts the energy stored in the inductor in series with the energy from the power supply, effectively increasing the voltage by the amount provided by the power supply.  This cycle repeats over and over again, eventually building a very high voltage in the inductor and capacitor( or LC) circuit.

Timing on such a circuit is very difficult, but that is the brilliance of Lawton's driver.  Being off by 10% or more in timing is about the best even the most brilliant among us have accomplished.  This is due to the changing characteristics of the LC circuit.  As the HHO cell produces gas, the dielectric strength changes.  This makes the capacitance of the cell change, in turn changing the charge time of the cell.  Forcing the pulses in for short durations is doable, but over time the pulses from the power supply and the energy coming from the cell would be out of phase, and cancel each other out.  Lawton's circuit allows for this miss timing by allowing the LC circuit to settle down every so often.  That is the soul purpose of the long duration gate.  The sort duration gate applies the pulses to actually create gas.

Comment by Ben on March 26, 2012 at 3:32am

I have made a copy of the Dave Lawton  gated device.  On the bench it works well.  I have tried to make a bi-fillier coil to boost the voltage as per "Patrick J. Kelly - Practical Guide to Free-Energy Devices"  but can not get it to work.  Would it be feasible to hook au a car ignition coil to get the extra voltage and how would I wire that up.

Comment by John on December 14, 2011 at 7:26pm
Try an igbt instead of straight mosfet
Comment by Todd Miller on December 2, 2010 at 10:41pm
This is Andrija PUHARICH Water Decomposition by AC Electrolysis Circuit...

And waveform

Here's a link to the pulsing power supply needed to pull this off....

Eastern Voltage Research Plasmasonic


- Full-Bridge switching circuit for high power operation
- Configurable as pulsed SSTC or CW SSTC (Audio Modulation)
- Customizable Audio Filtering
- 10-Step LED Onboard VU Meter
- Connects directly to practically any audio source
- Operates from 50kHz to 350kHz
Link to the instructions for the Plasmasonic Board

This is the calculator you need to find resonance you must start with cell build then measure capacitance for your primary value. Also you will have to convert your capacitance value range to 1 the program will accept example uF to pF...
Tesla Coil CAD... Version 2.0 Now Available
Comment by Richard Collins on October 2, 2010 at 5:07pm
I have been adding new content to the Meyer Research Group. If you research Meyers work then please join that group as well.
Comment by Richard Collins on September 28, 2010 at 12:28am
Thank you so very much for the Circuit Simulator. Here is a gift from me to everyone. Watch the 12V Square Wave @ 21.63475khz it takes the voltage felt at the 100pf capacitor to 5.06 MILLION VOLTS!!!!!

$ 1 5.0E-6 89.03963197220334 50 5.0 43
w 288 176 848 176 0
w 848 176 848 320 0
w 848 320 848 464 0
w 848 464 288 464 0
w 288 464 288 432 0
w 288 176 288 208 0
l 288 208 464 208 0 1.0 8.378639920594612
l 288 432 464 432 0 1.0 8.378639920594612
l 288 304 464 304 0 1.0 8.200730025759489E-16
l 288 336 464 336 0 1.0 8.200730025759489E-16
w 464 304 464 336 0
w 464 208 512 208 0
w 464 432 512 432 0
w 512 320 544 320 0
w 848 320 816 320 0
d 288 208 288 304 1 0.805904783
d 288 432 288 336 1 0.805904783
c 816 320 736 320 0 1.0E-10 3598382.0875398726
R 544 320 576 320 1 2 21634.75 12.0 0.0 0.0 0.5
g 736 320 704 320 0
w 512 320 512 432 0
w 512 208 512 320 0
o 18 64 0 35 20.0 102.4 0 -1
o 17 64 0 35 5242880.0 102.4 1 -1

Tell me if you see what I am talking about.

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