Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

Then i found that i have probably some kind of groundloop via the scope probes when using 1 probe to sync capacitively on pin 8 of the NP and the other probe across the csr.
Perhaps its better to use inductively coupled sync point, but with a better transformer.

Well, the attached scopeshot represents a perfect trigger signal.

[verpies]

Then i found that i have probably some kind of groundloop via the scope probes when using 1 probe to sync capacitively on pin 8 of the NP and the other probe across the csr.
Perhaps its better to use inductively coupled sync point, but with a better transformer.

Due to a character flaw, I often assume that things are obvious to others if they are obvious to me.

In this case I assumed that always you were using the filtered +V_2B voltage as a reference, as shown in Fig.18.
The unfiltered voltages (e.g +V_1A +V_2A) should never be used for anything else except inputs to voltage regulators and filters.
Unregulated/unfiltered/nonstabilized voltages must not be used as measurement reference points/levels !

Do you still get this awful ringing when you use +V_2B as the reference level, with probes connected as in Fig.19 ?
Does the +V_2B voltage sag much when you measure it as shown in Fig.20 ?

[itsu]

Due to a character flaw, I often assume that things are obvious to others if they are obvious to me.

In this case I assumed that always you were using the filtered +V_2B voltage as a reference, as shown in Fig.18.

You put that down nicely, thanks.   

I did use the unfiltered voltage (+V_2A) for this trigger point.

Do you still get this awful ringing when you use +V_2B with the probes connected as in Fig.19 ?
Does the +V_2B voltage sag much when you measure it as shown in Fig.20 ?

I will have to re-arrange some parts to accommodate this change.

Regards itsu

[verpies]

I'd like to note the the Helper Diode (D2) on this diagram is optional because ideally, the Flyback Diode (D1) will "catch" any inductive flyback pulses of the reverse polarity (drain more negative than source).
However if the circuit is not ideal (e.g. has stray inductance or rings uncontrollably or T1 feeds back from secondary to primary winding) then the Helper Diode (D2) might do some good.

Also, it is important to remember that D2 will not protect the MOSFET (Q1) from excessive high voltage in the forward direction  (drain more positive than source) - for that, a 200V unidirectional TVS Diode is needed.

[itsu]

@all,

despite some problems with noise and ringing in my nano-pulser circuit, even after re-arranging some parts, i managed to squeeze a 800V / 19nS pulse out of the 1n5408 dsr diode.
The drain voltage was 150V and the nano-pulse width 140nS.

The MOSFET did get hot, but it was operating without a heatsink.

So slowly i am getting towards the 1Kv.

Video:  http://www.youtube.com/watch?v=7_J05YWfLLs&feature=youtu.be

Regards Itsu