Self running coil?

[mscoffman]

deleted

[gotoluc]

They have a gray coating.

Yesterday i made a core from a high-permeability material which is similar to Nanoperm or Metglass. With this core there was a considerable drop in inductance when i attached the magnet. With the N48 magnet it decreased by more than 99%. So i used a much smaller magnet. But also with this coil, i didn't get any remarkable effects. Not even a real resonance. The combined inductance without the magnet was about 400 mH (3 layers of wire).

I think i will not put any further effort into this topic.

Thanks for the reply skywatcher,

I just measured my coils inductance (setup in video 11 and 12) and it is about 11.75mH

One last test I would suggest is you attach you inductance meter and slowly bring your magnet so you get as close as you can to that inductance value. Make spacers so it stays at that inductance and then pulse with 12.88vdc in the 38KHz range @ 50% duty cycle. You should find a frequency around that range that the current will drop by lots.

Question: are you using a signal generator or a 555?

I get the best results using my signal generator then the 555 timer. I will try to figure out why.

Thanks for sharing

Luc

[LightRider]

@LightRider

Excellent, if true. Please, don't repeat errors of the past, use the optoisolator method
to delete added function generator energy early. The asymmetric 4n35 opto signal may
work..It might even make things better. . If not, operate the signal generator at
2 x f and run the opto output through a cmos /2 FF flip-flop with circuit energy supply
coming from the bulk capacitor. Please keep us informed with what happens.

Also, what value bulk capacitor are you using?...that will affect energy to voltage
conversion speed.

:S:MarkSCoffman

500 VDC - 240 MFD.
39.6 kHz - 8 vpp (square)
9v battery.
9.10v -> to a maximum 12.10v (when disconnected)
4N35 opto is currently tested... (result tomorrow)
Thanks,
LightRider

[LightRider]

Preliminary results with the 4N35 opto :

Frequencies were swept (taking into account the 4N35 tolerance)
Different duty cycle has been tried

but...
In the best case, the cap drains very slowly.
but does not continue to fill as in previous results (first circuit without the 4N35).

Perhaps the setup or adjustments are not optimal...
but it seems difficult to arrive at the same result with the 4N35.

setup:
the 4N35 was added to trigger IRF640 Gate.
the rest of the circuit remains unchanged...
circuit with a 9v battery.
500 VDC - 240 MFD cap.
IRF640 mosfet
same toroidal coil

Thanks,
LightRider

[Magluvin]

Sorry Ms  I must have missed something. =]
I assumed in reply without all facts.

Was thinking. Self Running coil may be a key set of words to think about.

Lets say the coil is in resonance and the mosfet is just tapping or kicking along. On the scope shots, are we seeing a ring within those spikes? Or is it that the pulse sent in, comes back in a larger form and then done.

If that return pulse is more than what went in, then if we have another coil tuned in the same manor, then we redirect with a diode the reverse pulse to the second tuned coil, of which you should get a return pulse that can be sent , via diode to the next tuned coil, and so on.  Each step increasing output to the next.  Now being that it is working at low freq, there must be delays along the chain, so a no. of tuned coils would have to be determined to be back in phase at the end if we wanted it to be a true self running coil. But using a timer or sig to drive the first coil in the chain and collecting the higher output is good too.

Maybe only 2  tuned coils can feed each other till melt down. lol   But a load or fused circuit can prevent that.

I think when you get to using more than 1 identically tuned coils in the right config, things are really going to happen.

mags