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Re: [TCML] Rectifying a Tesla coil (was Franklins bells)



Many years ago I tried placing an insulated sphere outside of my coil's striking range. he sphere was also connected a small HV doorknob capacitor with the other end of the cap connected to ground. When running the coil, corona rectification(?) was sufficient to charge the sphere and capacitor to a substantial (10's of kV) DC voltage. This should be easily sufficient to operate Franklin Bells.

Bert

pterren@xxxxxxxxxxxx wrote:
I don't know anyone who has rectified a Tesla coil to produce pure DC.
A string of IN4007's would be unlikely to do it as their recovery time
means they are not much good over 20kHz, let alone 2-400kHz for a small
coil.
High speed diodes would work but you would need very many and they might
not be avalanche rated.
I tried a string of points/concave electrodes without much success.
Has anyone else had proper success?

Rectifying a Tesla coil attempt
http://tesladownunder.com/Failures.htm#RectifyTC
Franklins bells http://tesladownunder.com/HVsparks.htm#Franklin

Peter





-----Original Message----- From: Antonio Carlos M. de Queiroz
Sent: Thursday, April 12, 2012 7:39 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] franklins bells?

On 10/4/2012 20:15, James Hutton wrote:
Hey, will franklin's bells work with a tesla coil? I would test myself
but i am lacking a tesla coil at the moment.thanks!
franklins bells: http://www.youtube.com/watch?v=SYPRYQ0nU
You need DC for this, less than 10 kV, and insignificant power. I have
some videos:
Using a charged Leyden jar:
http://www.youtube.com/watch?v=YTK2FWJOreg
Using an electronic doubler of electricity:
http://www.youtube.com/watch?v=DikVuKpWNHM
Using an electrophorus:
http://www.youtube.com/watch?v=tYypXI9Zhtg

Antonio Carlos M. de Queiroz



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--
Bert Hickman
Stoneridge Engineering
http://www.capturedlightning.com
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