Kapanadze Cousin - DALLY FREE ENERGY

[zcsaba77]

I found that when "overclocking" the TL494 the two complimentary outputs aren't so symmetrical any more, so I just used the + output and split-inverted that using a couple of 2n7000 minimosfets after the TL494, to drive an intermediate current amplifier stage before the main mosfet H-bridge.

Do you mean exist 2 output on ic work like flip-flop?

[itsu]

Hi Itsu,

You say that the 250uH is just on the border. Have you tried reducing the inductance? I have less than 250uH.

Regards
Hoppy

Yes, i used a single turn on a nanoperm core (55uH), but with that it went straight into special mode.
Repositioning the choke physically at the input and changing the 470 Ohm resistors for normal metal film ones does not change much.
So i am still puzzeled about this special mode, with the big air core coil (Leader Genie replication) it never does that with each choke i tried.
Guess its something introduced by the ferrite or the split (mechanical resonance?) of the yoke, or simply the higher inductance.

Regards Itsu

[zcsaba77]

hi zcsaba77,

The highest i have done was nearly 500khz while selecting right capacitors for the PWM I/C.There is no requirement for me to go higher because the average common mosfet and igbt would stop working after certain frequency is reached.Base on datasheet the lowest duty cycle is 3%.

My most expensive CREE mosfet in my possession cost $16USD per piece as sold in digikey is able to produce nice waveform up to around 310khz using 20volts signal at gates.

If you are just playing around with yoke and other ferrite core the 3525 or TL494 will do.

Air core would need frequency higher than 200khz base on my findings.

I see. And what you think about Daly's/Ruslan's oscilator's ic '74HC(T)00' what drive coax coil trough FET KT926? its able produce HV nS pulse with this? or it is again just disinformation?
http://html.alldatasheet.com/html-pdf/92514/PHILIPS/74HC00N/2254/9/74HC00N.html
I reading the ic's datasheets, but for me too complicate, I found fastest pulse is on output 19nS, if I good understood.

[magpwr]

I see. And what you think about Daly's/Ruslan's oscilator's ic '74HC(T)00' what drive coax coil? its able produce nS pulse with this? or it is again just disinformation?

hi zcsaba77,


Nanosecond pulse It's likely referring to duty cycle less of  than 10% by the Russian.(Just ignore the word nanosecond it's confusing for many to understand)
Maybe the nanosecond is referring to the bemf pulse which can be in the ns range."The fall is surely  faster than the rise time in this scenario"

Even if you assemble a 1% duty cycle signal generator.The mosfet would be too slow to detect a eg:1% duty at the gates.Remember this there is gate capacitance in all mosfet and IGBT and these varies as seen in datasheet.For capacitance there is certain period of  voltage\signal  rise time needed.

Imagine this if there is a gate capacitance of 2nf at 1% duty in other words the period of the duty cycle isn't long enough to trigger the mosfet.

My findings the mosfet will start conducting at around 5%...7.5% for the duty cycle.


There is no such thing as if and buts once you have starting experimenting to just know the outcome.

[magpwr]

Yes, i used a single turn on a nanoperm core (55uH), but with that it went straight into special mode.
Repositioning the choke physically at the input and changing the 470 Ohm resistors for normal metal film ones does not change much.
So i am still puzzeled about this special mode, with the big air core coil (Leader Genie replication) it never does that with each choke i tried.
Guess its something introduced by the ferrite or the split (mechanical resonance?) of the yoke, or simply the higher inductance.

Regards Itsu

hi itsu,

May i suggest something which would assist you to secure this special mode 100% of the time.
Once you get yoke running in special mode and then try placing probe nearby or connecting probe .
Once you have discovered the special mode frequency the yoke is running.Apply this by assembling a pwm generator to recreate the signal to feed the 2 mosfets at the primary coil.


The question where do you want to go from here like how you plan to connect to another main coil on pvc pipe.