Kapanadze Cousin - DALLY FREE ENERGY

[Hoppy]

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 !!

Сергей Ð',

Could you please provide a specification for the two rectifiers in series with the 1nF cap across the secondary winding of TR1?

Regards
hoppy

[Vasiliy Buslaev]

Hi all
it uses a rectifier diode in avalanche mode.
Diode type: KD203A

Translate:
Maximum Reverse Voltage - 420 volts
Maximum forward current - 10 A
Maximum recovery time - Unknown
Maximum reverse pulsed voltage - 600 volts
Maximum pulse direct current - 100 A
Maximum reverse current - 1.5 mA
Maximum forward voltage - 1 V (at a current of 10 amperes)
Operating Frequency - 1 kHz
Operating Temperature ...... -60 .... +125 degrees Celsius
Capacitance of diode - not shown

According to the book from which Dally learned information on the use of diodes in the avalanche mode, you can use many types of suitable diodes. I'm sure you can find a replacement.

Regards

[Hoppy]

Hi all
it uses a rectifier diode in avalanche mode.
Diode type: KD203A

Translate:
Maximum Reverse Voltage - 420 volts
Maximum forward current - 10 A
Maximum recovery time - Unknown
Maximum reverse pulsed voltage - 600 volts
Maximum pulse direct current - 100 A
Maximum reverse current - 1.5 mA
Maximum forward voltage - 1 V (at a current of 10 amperes)
Operating Frequency - 1 kHz
Operating Temperature ...... -60 .... +125 degrees Celsius
Capacitance of diode - not shown

According to the book from which Dally learned information on the use of diodes in the avalanche mode, you can use many types of suitable diodes. I'm sure you can find a replacement.

Regards

Thanks Vasilly and welcome to the forum.

Regards
Hoppy

[Vasiliy Buslaev]

Thanks Vasiliy and welcome to the forum.

Regards
Hoppy

Hi Hoppy and all
Thanks
Very pleased that this information may be useful to you.
However, I am very busy at work. But as far as possible I will take part in the forum.
This is a basic diagram of Dally

Transformer, which operates in the saturation mode, applied
ferrite ring type K7-4-2. The first element - the outer diameter = 7 mm.
inner diameter = 4 mm, thickness = 2 mm. Magnetic permeability = 3000 ..... 6000.

Regards

[starcruiser]

I would think the coax length would be chosen by looking at the wave length of the pulse width.

1nsec = 1Ghz

1/4 wave = 250mhz or 11.23" of coax

1/2 wave = 500mhz or 22.464" of coax

we could look at a harmonic but would probably want to consider an odd order harmonic, say the 3rd, 5th, or 7th (prime number ...) when driving the line and reduce the impulse frequency. I am not sure if we would need to sync this or not with the transmission line standing wave.

I am not saying this will work but is a starting point since the transmission line (coax) will probably need to be longer or shorter than the ideal length matched to the pulse width.