Kapanadze Cousin - DALLY FREE ENERGY

[Hoppy]

Hoppy can you give more info about the Litz wire that you want to use?
Some picture or datasheet?

Thx!

Hi dorcky,

I have attached two photos. One shows the double 'E' core transformer with the Litz wire ends. The Litz is 8 strands of around 0.25mm. I recovered the wire from a surplus coil. The second photo shows my inverter, VCO and nano pulser.

Regards
Hoppy

[Black_Bird]

@verpies, @itsu

Actually the snubbing zener diodes should be above 2*VCC  because there is an auto-transformer action in the primary: when one of the mosfets is cut-off and the other saturated, this side of the primary will induce a VCC voltage over the other side. That will add to the power supply voltage, totaling 2*VCC in the drain of the cut-off mosfet. So, snubbing Zener diodes should be a little above that.

[verpies]

Black_Bird is right. Thanks for pointing out the addition of the Vcc.
I made a mistake with the direction of the induced current in the open primary and after his comment I had realized that the flyback pulse created by opening the first MOSFET and the pulse created by energizing the other primary through closing the second MOSFET, have the same polarity.

I have edited the schematic in Reply #83 to still use the Zener diodes rated at slightly more than 1*Vcc.

This is a new and different schematic and Black_Bird's observation was applicable only to the old version.

[Сергей В.]

ПривеÑ, itsu

We on http://realstrannik.ru still waiting oscillograms and measurements which Dally have promised so we will see does this will be or not ??

About main oscillator on TL949. I think his frequency is not 4.6KHz. I don't know why you have chosen exactly that frequency when according to my calculations main oscillator frequency is somewhere between 10.89КHz and 1.11 MHz (theoretically). In fact upper frequency depend only of production characteristics of IC494. Knowing Switch Power Supplies parameters i can tell you for some good PSU frequency is about 150KHz-300KHz and depend mainly from frequency characteristic of ferrite cores !!

I did some little modifications of Dalley schematic. You can drive main power transformer direct with power mosfets from TL494. If you want very high switching speed and sharp eadges of signals on gates of MOSFETs use some good driver like 4420 or rise voltage on TL494 on 30-40 Volts, increase value of 150om resistors on 470-680 and you will decrese time of charging source-gate capacitance Ciss. To avoid parasitic oscillations on gates put MOSFETs as possible as you can near the driving pins 9,10 of TL494 or put small ferrite beads near the gates. Resistor in series with gates also prevent parasitic oscillations but reduce switching times and must not be big values. Always shunt this resistor with good unipolar capacitor to improve switching speed, decrease equivalent input capacitance and sharpen eadges. It's important that all grounding be in one main point (use good wire mesh for main ground) and avoid long conducting wires!!

Don't use Zener diodes for snubber. Use 1-2nF/2KV capacitor in series with resistor from 47-100 om/ 5-10 Watts!!


About Nano Pulser read and study this articles:

1. AN IMPULSE GENERATOR FOR THE GROUND PENETRATING RADAR Vitaliy Prokhorenko
2. HIGH POWER SUBNANOSECOND GENERATOR FOR UWB RADAR Vitaliy P. Prokhorenko, Anatoliy A. Boryssenko
3. DRIFT STEP RECOVERY DEVICES UTILIZATION FOR ELECTROMAGNETIC PULSE RADIATION Vitaliy Prokhorenko, Volodymyr Ivashchuk, Sergiy Korsun

When you finish Nano Pulser you need to do some TDR (Time Domain Reflectometry) testing of your coax like on picture below. This is a job for 1GHz bandwithd Oscillograph or better. I am interesting how your OWON will fight with nano pulses !!

Удачи всеÑ... благ !!

[d3x0r]

The 4.6Khz frequency is probably an artifact of the toroid he used... I'm seeing a much higher frequency  - 500khz easy.....


My toroid rang for a while, but after connecting more load and tuning for highest output to +150 supply, it's quiet.


My 13009 drivers on primaries of toroid get VERY hot