Kapanadze Cousin - DALLY FREE ENERGY

[Jeg]

For those of you with DSOs, you should be able to try another method, and grab the result with the Single-Shot sweep mode of your scopes. Connect your scope probe across the coil, with the tip at the "top" or HV end and the ground probe at the other end.

Thanks Tinsel, i will try it assap. The only drawback is the parallel capacitor of the probe to the grenade's ends. This will give rise to false resonances. Just one turn around the grenade is enough for connecting the probe and see the ringing. In addition, a good way for firing grenade is a multi turned coil, firing grenade side by side of its thin portion and with some few cm distance apart from it. This is for eliminating capacitively interaction between grenade and triggering coil, as this is also a reason for getting rise of other than the real resonance frequencies. These difficulties rise of the fact that we play at high frequencies, and few pF can make a difference to the result.

[Dog-One]

I remember now that you are not using Arduino but some other type of micro-controller.  I am interested in your solution for this application.
Are you thinking of  interfacing your micro with a discrete PLL chip? Or going to run complete logic control/signal generation via the micro?

Yes, I'm using the Cypress PSoC 5LP since it can do hardware logic plus analog.

I built a PLL module inside this controller that seems to work well; all it needs are the external low-pass filter components.  The approach is to generate the proper high frequency burst pulses, then divide this clock frequency down by 100 and shape it into a sine wave to drive the yoke via a high power class-D audio amp, provided of course my low frequency is still in the audio range.

The goal is to end up with just four main pieces:  The controller, the audio amp, the Tesla MOSFET driver and the DC/DC step-up board.  If I can get this to work, the final prototype will be pretty much plug-n-play for future optimization.  The other benefit is I may be able to implement some sort of sweep tuner logic in the controller allowing it to find and lock into whatever coil setup you connect it to.

Yes, if a couple of us somehow manage to get this figured out, I'll do my best to provide kits for those that are still struggling.  That's way down the road, but I tend to think ahead.  I don't count my chickens before they hatch, but if they do hatch, I know exactly what I'll do next. 

[TinselKoala]

Thanks Tinsel, i will try it assap. The only drawback is the parallel capacitor of the probe to the grenade's ends. This will give rise to false resonances. Just one turn around the grenade is enough for connecting the probe and see the ringing. In addition, a good way for firing grenade is a multi turned coil, firing grenade side by side of its thin portion and with some few cm distance apart from it. This is for eliminating capacitively interaction between grenade and triggering coil, as this is also a reason for getting rise of other than the real resonance frequencies. These difficulties rise of the fact that we play at high frequencies, and few pF can make a difference to the result.

Very true, thank you for pointing that out. However, if there is a capacitor associated with the tank circuit already, that capacitance is likely to be several orders of magnitude greater than the probe's few tens of pF capacitance. Also, the voltage sensed by the probe will be a lot greater when it is directly connected to the coil, rather than to a loop or two around the coil. It's true too that you can get different frequencies of ringing depending on the method used, since you can be seeing harmonics and also capacitive effects.

[TinselKoala]

@Dog-one: Thanks for the offer, I hope something comes of it!

[T-1000]

With respect, that does not answer my question.

What is question, to be exact? If you refer to circuit versions, I can't tell which is latest.