Self running coil?

[skywatcher]

@Luc:

Today i made a toroidal coil, based on your schematic.

My ferrite core has a inner diameter of 23 mm and outer diameter of 35 mm.
I used 0.4 mm wire, only one layer.

The half-winding A-C has 81.2 mH, the half-winding B-D has 81.3 mH.
If i connect B to C as in your schematic and measure at A and D, i get 315 mH.
That's according to the theory, because the number of turns has a quadratic effect on the inductance.   
But it's not the difference as in your example. 

The difference (0.34 mH) i get when i connect A to B and measure at C and D.

I think there are some inconsistencies in your schematic. Maybe you can check it again...

[gotoluc]

Good vid. I would not worry about proving anything further on that matter. =]

Was thinking if another resonant circuit could be inserted that will drive the fet. As in if you start it with the sig gen, than remove the sig gen and the second resonant circuit could keep the fet pulsing. Or some sort of delayed feedback from the oscillator to trip the fet.

I see you are at 24v now. It must have climbed quick in that short of time and rested at 24v.

Also another solution would be to get a JT to pulse the fet. It will probably use less than the 555 or SG chip circuit. MK1 could probably suggest a lil kicker for ya.
And the jt bat would surely enjoy sipping on the cap.  =]

Mags

Yes that is the last

I can get it to 30vdc if I re-tune it.

On with the real work.

Luc

[gotoluc]

@Luc:

Today i made a toroidal coil, based on your schematic.

My ferrite core has a inner diameter of 23 mm and outer diameter of 35 mm.
I used 0.4 mm wire, only one layer.

The half-winding A-C has 81.2 mH, the half-winding B-D has 81.3 mH.
If i connect B to C as in your schematic and measure at A and D, i get 315 mH.
That's according to the theory, because the number of turns has a quadratic effect on the inductance.   
But it's not the difference as in your example. 

The difference (0.34 mH) i get when i connect A to B and measure at C and D.

I think there are some inconsistencies in your schematic. Maybe you can check it again...

skywatcher,

did you not see the previous page where I posted the new circuit with the correct way for connections. What you posted was a quick hand drawing I did.

Please read all the posts to stay up to date.

Circuit posted here: http://www.overunity.com/index.php?topic=8892.msg233190#msg233190

Luc

[skywatcher]

skywatcher,

did you not see the previous page where I posted the new circuit with the correct way for connections. What you posted was a quick hand drawing I did.

Please read all the posts to stay up to date.

Circuit posted here: http://www.overunity.com/index.php?topic=8892.msg233190#msg233190

Luc

Yes i saw it... but i didn't realize it was an update. I thought it only was a 'beautified' version of the first one.   

But it makes no difference. When i connect it like the drawing on reply #110, i also get the sum of the two inductances, not the difference. The direction of my windings is exactly the same as in your picture. The only difference is that i only have 1 layer, you have 5. But this should make no difference.

Tomorrow i will make some tests with the coil.

[mrock]

Hi Everyone,

This is the most up to date circuit.

Thanks Luc,
mrock