Kapanadze Cousin - DALLY FREE ENERGY

[lost_bro]

Hello Verpies

Yes, I did not think it was D2 that *clamped* the flyback spike on the *FET* (IGBT).  D2 must meet the DSRD criterion ( diode capacitance charging/discharging)  Shouldn't that be D1 (fast recovery diode) which clamps (re-routes) the flyback spike?
How much capacitance would be considered *sufficient* to demonstrate the DSRD effect?  The C4D20120 SiC has I_r=65uA @ V_r =1200V  & 175C and Q_ctotal=130nC @ V_r=800V.
Has anyone ever tried a SiC diode (as D2) in a DSRD setup just for shits & grins?
Maybe something new to try
take care, peace
lost_bro

Hello All

" The quarter period of the L-C circuit must be shorter
than the diode recovery time for fast current turn-off. A
diode fully saturated with charges will have a delay to
turn-off given by the recovery time presented in the data
sheets and the actual turn-off time will be approximately a
third of this delay. Thus, the diode should not be
saturated, as the pulse width then will be unacceptably
long. "

Just answered my own question......

take care, peace
lost_bro

[lost_bro]

Lost, 

i think the reflected nano-pulse will be "seen" and being taken care of firstly by the D2 (KD226D) diode.
This is a 800V diode, so i could put 2 in series to handle that pulse, not sure what 2 dsrd diodes in series does to the nano-pulse itself.

Itsu

Good day Itsu

Found this is the above attachment in my last post:

"Higher amplitude can be generated by using series
connected diodes. However, the saturable transformer
must be retuned for higher input voltages, as the time to
saturation is voltage dependent. This is not a trivial
matter, proper choice must be made between increased
number of turns or increasing the core area; none of
which can be made in a continuous manner. "

Looks promising for higher voltage swing at output.

and:

"The pulser has been tested at repetition rates up to 100
kHz with resistive charging, higher repetition rates can be
achieved with resonant charging methods at the cost of
increased complexity, especially in the area of optimizing
core reset. Ultimately the repetition rate is limited to
5 MHz by the duration of the charge transfer sequence."

So just maybe it is possible to reach higher pulse frequencies with *resonant charging methods*.

take care, peace
lost_bro

[MenofFather]

Daly stated on his blog that the end of the 50 ohm coax was shorted (at least that's how Google Translate translates it):

"Далее обмотка коаксиалом 50 ом (ранее применялся в компьютерных сетях) получается бифиляр - конец обмотки закорочен - нагружен на генератор наносекундных импульсов."
Google Translation:
"Next, the winding 50 ohm coax (previously used in computer networks) obtained bifilar - end shorted winding - loaded to the generator of nanosecond pulses."

From:  http://www.liveinternet.ru/users/edward_lee/post235233940/

Yes, here corect translation. End is shorted. Dally also mentioning in video, that end of coaxial is shorted.

[MenofFather]

   
   I'm still having problems finding a transistor that will oscillate now (burnt my last good one), when making an Exciter/Kacher circuit.  I tried a fet, also, same thing, won't oscillate. Anyway, I'm taking a small 15inch Tv apart today, to see if I can scrounge some parts from it.
  I'd like to make a strong Exciter circuit but one that won't overheat the transistor. Ha!  As I'm always having the Kacher transistors getting way tooooo hot. And I don't want to use a fan, so, I'm thinking about Exciter circuits, like Nelsons, but maybe taking the idea and modifying it in my own way. I wouldn't want to just copy it...  As I can't, in any case.
   So, I'm still on the hunt for wild turkeys....  And, I haven't seen any down here, yet.
 

Use bigger radiator for kacher. Put on other radiator kacher radiator, if you not have one big radiator. Then heat you can save more you transistor.

[d3x0r]

@itsu if this continues very far, should start another thread.. BUT.


You have a sweet peek power there.  Isn't that what Tesla wanted?  A ultra short impulse? 
So, just for grins, one could at 15khz put a tesla primary to the impulse generator? and run it at low hertz... wasn't it very low frequencies tesla said he saw aura around coil?  (Not bright sparks, but more ambient... aura)
secondary should be highly insulated??  At 1.5kv input you're already going to be sparking if it was a 1:1 ratio?


(UWB radio?)


edit: Don't measure it... to see if you have a voltage drop of 1.5Kv, just trust that you did, and it's very low resistance seconary.. might ground the low side though...


also someone was making alternate dimension for everything basing all units in basic space-time units (m, s) such as E=IR and R is  1/t.... but come to think of it his units didn't work... maybe it is T^-1 ?  anyway it causes a delay of current in a way so it backs up against a barrier and can be measured as voltage... should really just measure the current instead of voltage across resistor which I remembered just now you can also do.