Author Topic: Tube cell reloaded  (Read 17132 times)

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Re: Tube cell reloaded
« Reply #8 on: April 03, 2010, 18:43:14 pm »
I don't think the mathematical approach works here, too many imperfections.

Anyway, i got ~130V out of the transformer and probably 50V to the cap. When i played around with duty cycle and frequencies i noticed a point where very few little bubbles seemed to come out of the tube, amp meter showed 0,1mA like always on the hv side, but i guess i must have been mistaken. couldn't find the point again later.
i wrapped the coil in saran wrap btw, 12V dc / <0,1A current.
next step is to find out how the bifilar behaves and then how it works together with the cap. i'll also change the frequency generator to 100Hz steps, i'll have a range from 0 - 100kHz then. the 1n4007 gets hot when there's a current >1A at the primary, will need to change it too.
the good thing is with the saran wrap the voltage on the secondary does not break down.

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Re: Tube cell reloaded
« Reply #9 on: April 04, 2010, 00:48:14 am »
Is your transformer designed for 50-60Hz?

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Re: Tube cell reloaded
« Reply #10 on: April 04, 2010, 00:56:07 am »
yes it's a regular grid 230V : 12V transformer. I know the losses at high frequency will be higher but i don't have a better one.

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Re: Tube cell reloaded
« Reply #11 on: April 04, 2010, 02:14:10 am »
It may help to use higher frequencies in tune with 50-60Hz such as 120Hz, 240Hz, and so on. You just double the number and you will have the next octave. If your trying to resonate the secondary coil with a diode in the mix, there is a way to test in such a way to simulate working parameters and not needing a cell in the circuit. Try using an Avramenko Plug attached to one leg of the secondary leaving the opposite end open or unconnected. Connect a neon or higher voltage light bulb between the diodes of the Avramenko plug and adjust the primary frequency.

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Re: Tube cell reloaded
« Reply #12 on: April 04, 2010, 15:34:35 pm »
yeah i'm actually in the kHz range, my frequency generator is set to 0..200kHz in 500Hz steps.
gave the tank circuit another look, unfortunately my supply voltage doesn't double. will have to see what the problem is.
the transformer is really strange, instead of giving out round squares when fed with 50% square waves (picture on tech brief page 81) it's creating the sinus wave, which i can't use really. and the voltage isn't stepped up by factor 19 - didn't really expect it with squares - but only with the factor 2/3 if that at all.

when not using the transformer at all i can see the discharge pattern of the cap nicely, like on jnaudins page.
won't have time till tuesday or wednesday, will make an update then.

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Re: Tube cell reloaded
« Reply #13 on: April 04, 2010, 16:25:49 pm »
The secondary will always give you a sine wave type signal no matter how the primary is excited. That is why you need at least one diode on the secondary side. Ultimately, you need not worry about voltage and the use of transformers once you understand how the chokes work. I have attached a document that may shed some light on the subject.

Happy Easter!

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Re: Tube cell reloaded
« Reply #14 on: April 04, 2010, 18:17:36 pm »
thank you Bubz.

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Re: Tube cell reloaded
« Reply #15 on: April 05, 2010, 03:16:54 am »
Hi Bubz,

I read the charge pump pdf.  It's funny there's no mention of Nicola Tesla in there.  He did a lot of ground breaking work in that area.  It's amazing what he was able to accomplish considering the materials he had at hand.

Regards,
Andy