Kapanadze Cousin - DALLY FREE ENERGY

[d3x0r]

Working on TL494 side.  So this is actually a very high power part (high amp anyway)


(reads pdf of tl494 specifcation ; what does this thing do anyway... oh okay)


As a reminderI'm using the 2n5401/E13009 version {was browsing the two versions, and notice there is a difference using pins 9 and 10 of the U1 }  There's a 1k resistor pulldown to ground, if I increase that I would get more through the 2n5401; which are used for audio amplifiers to 200mhz... so it drains excess voltage from 9 and 10 (which I guess are only 250mA) from C1 and C2 (8 and 13) which is power;

In my picture, the blue probe is on P9, the ground of that probe is unconnected
the yellow probe is on a 0.11 ( 3x0.33ohm resistors in parallel, each 125A ).  with the ground on the power side, and the probe on the coil side of the resistor. 


It's all connected in the circuit, so there's a ringing from some sources...


the second picture (can I put pictures in-line?)  Is tuned at a different point in the frequency adjustment of U1...
the first picture is at a much higher frequency, so it's able to pull down more voltage on the driving coils...


the time in the first two is 200ns, so that's a 200 ns pulse from U1  frequency is larger than this frame... but the third is a picture of an overall... sometimes there is more of a rininging that happens instead of a nice pulse... but I dunno, I'm not getting to saturation, but I'm not really at V/R?  Or am I?




On top of that... if I change the mounting point of the power to the coil from internal board power it works differently also....  that is; I have 3 diode points to connect to, 1 25kV (hgih resistance) 1 1n4001 and 1n4004 , each connected on my power rail, and a 1ohm resistor... depending on where I connect I get other effects on the power of the circuit; that is, it makes my +12 kinda dirty,but through the 1n4004, it doesn't cause as much bounce. I increased the capacitance on the overall power... but maybe I should add that my power supply is connected to my apparatus through two Diodes each in normal conducting direction, and a 1ohm resistor on the negative, with some capacitors across power rail and ground rail after all of that, and a reverse diode uhh 1n4001 I think (only a 30V power supply)  with cathode on positive, in case that is driven low by back feed, empty capacitors, and exceeding limits of the supply, which is set about 12.xV limited with 1.5A limit probably, but if I'm using that much, E13009's get really hot... well unless they have a good on/off, it's more when they are kinda in a grey zone of conducting that they get hot....




See also http://youtu.be/1DOD-uFaHLk 


I should increase my capacitance  across the neons... but since they cap the voltage... I'm certain that the


Hmm somehow I think I ended up shutting it off early... I think if I had a bigger current available rather than 250mA, it could be driven more to saturation... I do see the front and tail of the saw tooth that should be there, but the top is terribly chopped, and some other thing is capping it. 

[d3x0r]

I solved (for a second) my concern about the amount of power available.  I installed a 400V 80uf cap across the neon bulbs.  Now, once I turn it off the neons stay lit for like 10-15 seconds all on their own... and there's plenty of spark left in the capacitor.


Hah nevermind   Yes, it's a lot of joules, but it drains in 250ms, and charges in 6s... (something like that) 
I either need to slow the pulser, or figure out how to get more high voltage watts.


----
Oh I found some info on the particular toroid I'm using....


http://www.ferroxcube.com/prod/assets/3c90.pdf
http://www.farnell.com/datasheets/491631.pdf  (TX58/41/18)


http://www.newark.com/ferroxcube/tx58-41-18-3c90/ferrite-toroid-58mm-3c90/dp/63R5862

[verpies]

the yellow probe is on a 0.11 ( 3x0.33ohm resistors in parallel, each 125A ).  with the ground on the power side, and the probe on the coil side of the resistor.

I hate to write this to you but your current waveform is all wrong, because:
1) You are using inductive wirewound resistors for your current sensing resistors (CSRs) - marked with blue ellipse on the photo.
2) The high current and high di/dt wires are too long and they are acting as inductors. (they should be 3 inches at most)
3) You are not using starpoint grounding and starpoint power distribution (see diagram)

I'm afraid that you will have to replace your CSRs with non-wirewound resistors, rewire your circuit's ground/power and redo your measurements

[d3x0r]

I hate to write this to you but your current waveform is all wrong, because:

No worries; so I guess the back spike is the field behind collapsing

1) You are using inductive wirewound resistors for your current sensing resistors (CSRs) - marked with blue ellipse on the photo.

Of course those aren't right... I couldn't have luck and pick the part that was high enough current  and not be inductive  

2) The high current and high di/dt wires are too long and they are acting as inductors. (they should be 3 inches at most)

Just to confirm, was looking at dally pics,... and the power wire would be one of the white wires coming off the toroid, but disappearing beneath the tl494 board;  the other two from two different posts go to a green screw down connector on the edge of that board... those are all thinner wires than the wires on the atx power supply... so they don't have to be so thick?

3) You are not using starpoint grounding and starpoint power distribution (see diagram)

I actually am... although the wires are ~1.5 feet long, and would be measured in nano-henries... if I connect a second one in series there is a modification to the readings, so removing that would be good, but basically the power goes here, and from that power point I power the one board, and the nanopulser is chained off of that further down...but it has its own voltage regulators... and really all the grounds go to a fairly common ground point, but I can see putting the emitters(?)(sources?) of the inverter closer to the ground source...

I'm afraid that you will have to replace your CSRs with non-wirewound resistors, rewire your circuit's ground/power and redo your measurements

Most of it is rewired, but What I do have is 8 inches of 32 gauge wire which should be .1 ohm... but it's far from high current...

[itsu]

@all,

Ok, made some changes as adviced by verpies, and the signal on the drain of the MOSFET improved dramatically.

I now have a nice sharp 200V pulse of about 70ns which can be varied by a 10Kohm potmeter till 500ns.
Repetition rate of the pulse can be varied between 700Hz till 350Khz (not shown in the video).
Video here: http://www.youtube.com/watch?v=ACNzggg1QC0&feature=youtu.be

Next step will be to hookup the small toroid and the DSRD diodes and hunt for the 1ns/1KV/1Khz pulse

Regards Itsu