I misunderstood this, so you have conductive film actually touching the belt? You need high charge density to create plasma/corona so there must be some low-level roughness to either material to get this to work right?
Sent from my HTC
----- Reply message -----
From: "doug" <doug11642@xxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: [TCML] VDG pickups (was Ignition coil driver)
Date: Wed, Dec 23, 2015 7:38 AM
Derek, I am sorry, I do not know the tribo property's of the plastic.
Here is my theory on why it works so well;
With the pickups sitting a little away from the belt you can see little
sparks passing, that is energy, like a spark gap. With the pickup point in
contact with the belt there is no charge dissipated from jumping the gap.
I could be wrong on this theory, all I know is that it works!
I use the same stuff on my Wimshurst machines in contact with the discs with
great success.
Here is the link to my source>>
http://www.all-spec.com/products/65-18.html
Doug
-----Original Message-----
From: ExtremeElectronics.co.uk
Sent: Wednesday, December 23, 2015 2:51 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] VDG pickups (was Ignition coil driver)
Doug,
So the film is actually touching the belt?
If so, then you are adding another place for charge separation, as
well as collection. Any idea where on the tribo electric scale the
conductive film sits?
Would that account for the extra current ?
Derek
On 22-Dec-15 10:55 PM, doug wrote:
> Hi Derek; What you see is conductive plastic film riding on the rollers
> attached with copper tape, rollers are PVC and aluminum tape covered
> acrylic. I did do comparisons, plastic film produced 30% more current.
> Belt Is neoprene.
> Doug
> -----Original Message----- From: ExtremeElectronics.co.uk
> Sent: Tuesday, December 22, 2015 4:52 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] VDG pickups (was Ignition coil driver)
>
> Doug,
> From what I can see from the videos, you are using a thin piece of
> copper for your pickup. Have you done any comparison between that, wires
> or gauze. Do you see an increase in current or voltage ?
> What is the composition of your rollers and belt ?
>
> Derek
>
> On 22-Dec-15 2:34 PM, doug wrote:
>> Hello Derek;
>> Thank you for your comments and including a link to my youtube video. I
>> have included a link to my youtube page so you can take a look at some of
>> my VanDeGraaff projects. I think all VDG builders are using the wire or
>> screen type pickups on their VDG’s, I have found something MUCH better.
>> You can see it in operation in some of my videos.
>> https://www.youtube.com/user/dr043042#p/u
>> https://www.youtube.com/watch?v=YCWAH-J091c
>> https://www.youtube.com/watch?v=uoS7sOy2Src
>>
>> Thank you again, Doug J.
>>
>> -----Original Message----- From: ExtremeElectronics.co.uk
>> Sent: Friday, December 18, 2015 11:35 AM
>> To: Tesla Coil Mailing List
>> Subject: Re: [TCML] Ignition coil driver
>>
>> You can get about 300W from 8 of them though..
>>
>> http://www.extremeelectronics.co.uk/electronic/v8-tesla-engine/
>>
>> Derek
>>
>>
>>
>> On 18-Dec-15 2:30 PM, Jim Lux wrote:
>>> On 12/18/15 4:39 AM, doug wrote:
>>>> Hello; I am looking for some information concerning Ignition coil HV
>>>> supplies. I am using 120V mains through a light dimmer and wonder if
>>>> there is something better and more robust than the dimmer? This
>>>> Ignition coil HV supply will be a dual coil setup using a 25.0uf/370VAC
>>>> motor run Cap.
>>>>
>>>
>>>
>>>
>>> Not as cheap..
>>>
>>> any of the standard capacitor discharge electronic ignitions basically
>>> put 400V pulses into the coil to generate HV.
>>>
>>> 6000 RPM in a 8 cylinder engine is 200 Hz
>>>
>>> typical energy per "pulse" is 100 mJ so 200 Hz is 20 W
>>>
>>>
>>> _______________________________________________
>>> Tesla mailing list
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>>
>> _______________________________________________
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>
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