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1MΩ will charge the probe's capacitance slower. 
Difficult stuff.

So; basically, if Dally got an oscilloscope, that his measurements might not even be the same as when it's actually operating... in the case of this nanopulse especially, the act of observing the circuit changes the circuit...


Also, it seems... adding the resistor and capacitor before the gate on the high voltage driver eats the pulse and makes it a long delay of quite moderate voltage (it's only 5 volts peek to start...) this is the right behavior?

I have now completed my main coil to the Dally's specification and build. The L1 & L2 winding inductances are as follows: -

L1 - 4.16mH @ 15KHz.
L2 - 519uH @ 200KHz

Measurements taken with a PICO LCR meter.

Approx measured resonance of L2 with 1.5uF cap - 12.5KHz.
Approx measured resonance of L2 with 4.7uF cap - 4.6 KHz.

See attached scope shots taken with x10 probe with coils fed square wave from signal gen.

How are you driving this main Dally coil?
If you are driving it with your own TL494 based generator, could you post a scopeshot of your drain (or collector) voltages on the primary side?

How are you driving this main Dally coil?
If you are driving it with your own TL494 based generator, could you post a scopeshot of your drain (or collector) voltages on the primary side?

From signal generator. My TL494 generator which uses 2N5401 driver / MJL21194 power transistors is not yet up and running on transformer.

Regards
Hoppy

I see.
Be warned that the >300V voltage spikes appearing on the collectors of your MJL21194 250V  transistors might damage them, unless you use some kind of voltage clamp parallel to the primaries of the transformer.
The clamp can dissipate (short-out) the voltage spikes or return their energy to the power supply. 
The latter solution is illustrated in my Reply #120 and Itsu has verified that this solution works.
This technique works even with the main Dally's Coil as the load (an LC Load), that has a nasty habit of feeding its energy back into the output of the TL494 generator/transformer.

As I'm using a mains transformer initially, how about transorb diodes across the primaries - 20V?

Regards
Hoppy

When Itsu tried absorbing the spikes with snubbers made out of fast rectifiers and 5W Zeners (2*Vcc), connected back-to-back (shown here as D3-D6), the snubbers could not handle the energy in the spikes and burned up. 
They also increased the current draw from his power supply.

Maybe your transorbs are stronger, but they will not return the energy back to the power supply.
This energy becomes significant when an LC load feeds energy back into the secondary winding of the transformer + TL494.

See attached. I use these in preference to zeners. The 1.5KW 22A version has a vbr of 20.9V min 23.1V max. I do not find normal 0.5W / 1.3W zeners adequate for transient suppression in this type of application. Clearly energy is lost as heat in the zener or transorb diode and this is not being recovered but if we accept Dally's self-running claim, he was not disadvantaged by this wasted energy!!

Alternatively, the SA24A is a 500W device with a vbr of 24V/26.7V with 12.8A pulse rating.


Regards
Hoppy

@ all

After rewinding the primaries according to the circuit/diagram designed by verpies and publiced in post #120 the main generator is stable and produces clean square wave voltages.

Both primaries are 20 turns of this double speaker wire over the whole circumference of the yoke

The voltages on the both secondaries is much to high (almost 900V square wave), so i will have to lower that, but for the time being i could show you the several signals present on the several windings of the main coil and how the tuning of the frequency influences the resonance of the L2 coil.

Finally i pulsed the coax with HV pulses of a flyback to see what is happening on the L4 coil.

Video to be seen here: http://www.youtube.com/watch?v=RU15rQEV-Rg&feature=youtu.be

With a big thanks to verpies.   Now continuing with the building of the nano-pulser.

OK, now we have an efficient 5kHz and stable driving circuit that can take the energy returned to the secondary and return it back to the power supply.  Stronger and faster Shottky diodes (D3 & D4) still would be a good improvement to it.

The MOSFET gate drive still could be made stiffer and faster by adding two more small BJTs per gate and the whole circuit still suffers from small spikes which are due to non-single point grounding and non-single point Vcc distribution as well as inadequate bypassing of the TL494, and excessive wire lengths, but this should not matter much unless you are a perfectionist.

The coax pulsing with the TV Flyback transformer nicely demonstrates that the pulses are not entirely confined inside the coax.
The conventional theory predicts that for an ideal coax shorted at one end, the waveform applied to the other end of the coax will be reflected from the shorted end but the resulting electric and magnetic fields will be completely contained inside the coax.

Itsu's experiment shows, that in practice, the pulses applied to the real coax are somehow coupled to L4.
Maybe the coax leaks or maybe it interacts with L4 via evanescent waves or something else entirely.

If the ns pulse amplitude is high enough, the above phenomenon should also make it possible to sense these pulses traveling inside the coax by fast SR-Latches, without the aid of an expensive GHz oscilloscope - all from the outside of the coax.

nevermind; I fried the chip with a diffeernt power supply .





okay so it's not a fault of the pulser noise I think; what I do get is through this  FJL4315OTU
http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/FJL4315OTU/?qs=ljbEvF4DwOMFc6Yt2N1Y8g58tzpPa9MR





This transistor I used as a replacement for the KT926 (200V(c-b) (unspecified c-e)  25A/5V(e-b)  50Mhz?)

FJL4315OTU (250V(c-b,c-e) 15A/5v(e-b) 30 MHz ) 

the E13009 is 400V(c-e) /700V(c-b)/ 9V(e-b)  (4Mhz)   


---------
Okay but the question is, if I apply positive voltage to the collector and ground the base and emiiter, current flows through the collector.  (if the base is low, shouldn't it not conduct?)


so the voltage should build in the capacitors behind it, except where the neon is, which limits the top voltage... but it's not static voltage, it must get current from the base  or emitter to conduct and make a signal in the coil it's attached to.


NPN doesn't conduct until a voltage is applied?  ... well it's a double diode right? so N-P conducts? no, becuase it's the base that's on the P, not the collector.  So ... it shouldn't conduct from base or emitter... maybe it's broken?  maybe it's got a fancy back diode in it?

@ all,

while still waiting for parts for the vco/nano-pulser, i build a small nano-pulser which was earlier proposed by verpies using a LT1073 dc-dc converter chip for testing the ability of my scope to "see" nano pulses.

Perhaps usefull for other builders to test their equipment as well.

Video: http://www.youtube.com/watch?v=s-Alj7gm0RA&feature=youtu.be

Regards Itsu