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Re: [TCML] VDG pickups (was Ignition coil driver)



Hi Paul; Thank you for the complement. The motors are sewing machine motors. Find a sewing machine repair shop nearby. Most of them will sell you a used motor for around $5.
Doug

-----Original Message----- From: p_novotny via Tesla
Sent: Tuesday, December 22, 2015 9:47 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] VDG pickups (was Ignition coil driver)

Hi Doug - excellent workmanship!

I built a homemade VDG generator too and it will shock me from about 18" away.

Mine uses a bedframe castor attached to a oscillating fan motor and it turns a belt made from nylon stockings over a teflon rod (just friction - not a roller). I use little metal screen patches as my pickup brushes. They don't touch the belt, but they seem to do an adequate job nonetheless. Where do you source your motors?

I am just putting the finishing touches on my first Tesla Coil at the moment too and am excited to try it out. These things are funny (kinda like the VDG generator) - you invest countless hours on it, not knowing if your are going to get an ounce of satisfaction from it. Hopin' for good luck on the Tesla Coil.

Thanks - Paul

--------------------------------------------
On Tue, 12/22/15, doug <doug11642@xxxxxxxxxxx> wrote:

Subject: Re: [TCML] VDG pickups (was Ignition coil driver)
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Tuesday, December 22, 2015, 4:55 PM

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



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