Kapanadze Cousin - DALLY FREE ENERGY

[Hoppy]

But what is the current through Tr1 when the MOSFET is conducting ?

From 32mA @ 12.6KHz, 240mA @ 69KHz to 360mA @ 113KHz.

Regards
Hoppy

Edit: Correction to current readings.

[verpies]

well, that kind of hard to measure as all frequencies or above the highest frequency of my FG (5Mhz), but by looking at the harmonics and the ringing i came to this result:
12t 1nF   =  5.721 Mhz
12t 220pF =  9.090 Mhz
6t  1nF   =  8.500 Mhz
6t  220pF = 11.300 Mhz

Something is wrong.

According to the formula for the LC circuit at resonance L = 1 / (4 * Ï€² * f² * C)

N          pF      MHz         nH
-----------------------------------
12      220      5.721    3518
  6      220      8.5        1594
12    1000      9.09        307
  6    1000    11.3          198

But we also know that doubling the amount of turns (N) quadruples the inductance (L) yet the calculated inductance in the 1^ST line is not 4 times larger than the inductance calculated in the 2^ND line.

Also, the largest calculated inductance is 17 times larger than the smallest calculated inductance, and they should be all very similar.

A constant stray capacitance cannot explain this !

Did you mess up your harmonics?

P.S.
Itsu, I thought that your sinewave FG had a range up to 50MHz.  If I knew it had a limit of 5MHz I would have suggested using a 4.7nF and 10nF capacitors in parallel with T1.

[d3x0r]

I've found that both so these seem to work fairly well in place of KT926. 


NTE-386
NTE-2319

I have these both driven with 2N5401.
But I'm also using a TL494 for my nano pulser, the pulse is 200ns long.  That's as short as I can make it at any frequency and have it be stable.   

I'm only using one side of outputs.  I'm using a 3200 turn coil of 28 gauge wire on a 4"x3/8" iron rod.  This gives a longer voltage recovery than the NTE recovers with.... so the near cap to TR1 dumps through the coil when it opens, then after it closes, the current makes it through the coil near there also.  (mine is 435mH... 0.436H on 2H scale, according to this particular meter)

I've also moved to a 12V battery source (small tractor battery).  Power runs from the batter to TR2, and to the 12V logic boards.  I've removed the voltage regulator parts.

I want to change my KD203 replacements... and reverse the output of TR2...

[Hoppy]

Yes, the inductance of the 12-turn winding should be 4 times higher than the inductance of the 6-turn winding (inductance is proportional to the 2^nd power of the turn count, see here )
It looks like the meter is measuring its own internal inductance (including test leads) or picking up some EMI

My toroid measured on a Peak Atlas LCR meter is 312uH for 12T Sec and 88uH for 6T Pri. Frequency 200KHz. Both readings taken with other winding open circuit.

Regards
Hoppy

[Hoppy]

Attached are scope shots (x10 probe connected to top of coil) taken across primary of my toroid. Nano cap 1.5nF. My circuit could do with a re-lay to improve the waveforms but I feel they are acceptable for experimental purposes.

The waveform begins to distort badly with a just a small increase in frequency, which is why I think Itsu had problems.

Regards
Hoppy