Kapanadze Cousin - DALLY FREE ENERGY

[Vasiliy Buslaev]

Kind time of days to all

I found a couple of articles on how to form a nanosecond pulses, then the same with saturable toroid. It is in English, you will be comfortable to read.

Regards
Vasiliy

[verpies]

So i made a 24 turn coil all along the circumference of the toroid OD 0.42 mm wire.
But even this coil does not show a correct inductance reading (same -0.016 uH as with shorted meter leads).

Are frequency sweeps of a parallel LC circuit made with this coil, equally bad ?

I then used a somewhat bigger (Blue) toroid and rewound the 6/12turns (0.42mm).
Measurements on this toroid are:
OD 16.6mm
ID  9.4mm
TH  6.9mm

L  6t = 173uH
L 12t = 669uH

I will be using this toroid for next experiments.

Well, it's the time to update this table with the data of the new toroid, then.

Using the formula for the relative permeability of a toridal inductor with rectangular crossection: μ_r = L / (0.0002 * TH * N² * ln(OD/ID) ) and the formula for the AL Value as A_L = L / N² , now we have:

Who             N     OD [mm]    ID [mm]    TH [mm]          L [μH]           Î¼_r        A_L [μH/N²]     Saturation Current [A]
------------------------------------------------------------------------------------------------------------------------------------------
Hoppy           6           11.0            5.0             4.0         88.000       3875          2.444                      ? ? ?
Hoppy         12           11.0            5.0             4.0       312.000       3435          2.167                      ? ? ?
Black_Bird   10             2.0            4.5             4.0           3.500           45          0.035                      ? ? ?
Itsu               6           16.6            9.4             6.9       173.000       6123          4.806                      ? ? ?
Itsu             12           16.6            9.4             6.9       669.000       5920          4.646                      ? ? ?
       

The ratio of Itsu's inductances (173μH and 669μH) evaluates to 3.87 which is close to the 4 predicted by theory for windings with 2:1 turn ratio.

If we assume that Itsu's inductance meter introduces a constant error by adding 7.66μH to every inductance measurement then the calculated permeabilities for the 6 and 12 turn windings become equal and the ratio of inductances approaches the perfect 4, like this:
Who              N     OD [mm]    ID [mm]    TH [mm]          L [μH]           Î¼_r        A_L [μH/N²]
--------------------------------------------------------------------------------------------------------------
Itsu               6           16.6            9.4             6.9       165.340       5852          4.593
Itsu             12           16.6            9.4             6.9       661.340       5852          4.593

By the same token, if we assume that Hoppy's inductance meter introduces a constant error by adding 13.33μH to every inductance measurement then his calculated permeabilities for the 6 and 12 turn windings also become equal and the ratio of inductances approaches the perfect 4, like this:
Who             N     OD [mm]    ID [mm]    TH [mm]          L [μH]           Î¼_r        A_L [μH/N²]
-------------------------------------------------------------------------------------------------------------
Hoppy           6           11.0            5.0             4.0          74.670       3288          2.074
Hoppy         12           11.0            5.0             4.0        298.670       3288          2.074


The saturation current cannot be evaluated at this time (no scope shots of high current pulses), however the relative permeability (μ_r) in the neighborhood of 6000 gives Itsu's core the best chance of saturating, because usually:
the higher the permeability - the lower the saturation point.

P.S.
That's bad news for Black_Bird

[verpies]

my E13009's do get VERY hot.  I would think that if I could make the current signal more pure, that they wouldn't be in half-on/off operation, and not have to be dissippating heat... if I layer something like a few amp high frequency transistor to power to drive drivers... would that improve the situation? or am I just rube-goldberging something  (other than that I am...)

Yes, if you drive your BJT fully into saturation, then their power dissipation will be minimal.
To do this you need to supply enough base current to the bases of these transistors. 
The h_FE or β of these transistors will tell you how much collector current (I_C) you'll get, for how much base current (I_B).  Don't exceed the maximum current rating of the base (I_B Max), though.

Unfortunately the β decreases for high collector currents, so if a range of βs or (h_FEs) is given in the transistor's datasheet, then you have to use the lower limit of that range.

[verpies]

Scope ground leads open, x10, AC coupling.  yellow is on the cathode of the diode, blue is on the anode of the diode, and purple is A-B, (cathode-anode) 

It's hard for me to visualize what you are measuring.
The current through the DSR diode would be most useful, along with the voltage across the diode.

Measuring current means using low resistance CSRs.

[verpies]

I found a couple of articles on how to form a nanosecond pulses, then the same with saturable toroid. It is in English, you will be comfortable to read.

Thanks Vasiliy.
Only the DSR Diode driver described in the 2nd article (nanosec-2.pdf) uses a saturable transformer.
Compared to this transformerless circuit, the inductances L1 and L2 are substituted by the leakage inductances of this saturable transformer.
That is described in Fig.1 and Fig.2 in Chapter II of this article.

Also, instead of the switching action of a MOSFET, the saturation action of the transformer is used, 
(although it is not explained how - does anyone understand this in depth ? ).

All of the above makes the construction of this saturable transformer very critical !!!