Re: Don't Try This

        Re: Don't Try This
        Sat, 12 Apr 1997 12:07:05 +0300
        Kenneth Aaron <kennetha-at-geocities-dot-com>
        Tesla List <tesla-at-pupman-dot-com>

At 10:31 AM 4/10/97 -0500, you wrote:

>        Re: Don't Try This
>  Date: 
>        Tue, 8 Apr 1997 04:49:35 -0700
>  From: 
>        "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
>    To: 
>        "Tesla List" <tesla-at-poodle.pupman-dot-com>
>The device you have created is not a Tesla coil.  It is called a
>Cockraft-Walton voltage multiplier.  It was first used to develop 600 KV
>back in 1939 to achieve the first atomic transmutation of the element
>lithium.  It is similar to a Marx generator but different in a few
>It can provide a continuous and well regulated output, and it does not
>sparkgaps as switches -- the diodes act as high speed switches to
>the caps in series.
>It was developed by a Mr. Cockraft and Mr. Walton and named in their
>If you repair your unit I suggest wiring a 500K 20 watt resistor in
>with the output.  Also used another dampening device such as a 500
>microHenry inductor -- also in series with the output.  That will keep
>diodes from frying in the event of any short circuit.
>Good luck and be careful -- charged HV caps are killers.  Even when
>discharged end to end the center caps in the group will still retain
>charge to zap you --- I also discovered this the hard way in my younger
>days.   Yes --- coilin' is safer.
>> From: Tesla List <tesla-at-poodle.pupman-dot-com>
>> To: tesla-at-poodle.pupman-dot-com
>> Subject: Don't Try This
>> Date: Sunday,April 06,1997 5:54 PM
>> Subject: 
>>         Don't Try This
>>   Date: 
>>         Sun, 06 Apr 1997 12:54:02 -0700
>>   From: 
>>         Gary Weaver <gweaver-at-earthlink-dot-net>
>>     To: 
>>         tesla-at-pupman-dot-com
>> Today while going threw some old papers I found a Xerox copy of a Tesla
>> Coil 
>> that uses a voltage multiplyer instead of a neon transformer.  It uses
>> 10 
>> diodes and 10 capacitors.  The diodes are 1N4007 and the caps are .001
>> uf 
>> 1000 volts.  The circuit suggests using an old TV transformer about 800 
>> volts for the voltage multiplyer circuit. The voltage multiplyer
>> discharges 
>> threw the spark gap across the LC circuit and the secondary coil output
>> is 
>> suppost to be 8" to 10". 
>> I decided to build it and try it.  If it works I will build the TC into
>> a 
>> nice little unit and put it on my desk at work. I looked threw my parts
>> and 
>> couldn't find any .001 uf 1000 volt capacitors to used in the voltage 
>> multipler circuit so I used 4700 MFD 200 volt capacitors.  I figured it
>> won't 
>> work with these caps but it will be fun to experement with anyway. I put
>> a 
>> volt meter on the 1st of the 10 capacitors and a 200 ohm 20 watt current 
>> limiting resistor in the 120 volt AC line.  I plugged it into the wall
>> and it 
>> took several minutes to come up to full charge.  Now I know this won't
>> work 
>> for a Tesla Coil.
>> I unplugged the wire.  I decided not to leave the capacitor bank setting
>> on 
>> the work bench with a full charge.  I decided to discharge the
>> capacitors 
>> threw the 200 ohm 2 watt current limiting resistor connected on the
>> output. I 
>> checked the resistor with the multi meter and it checked about 200 ohms.
>> When 
>> I connected the resistor to the output it discharged all the capacitors
>> in a 
>> micro second.  BOOM...........WOW, what a discharge.  
>> The 200 ohms 2 watt resistor looks like a piece of charcoal. The
>> resistor is 
>> still there but it is fryed.  All the diodes are gone except for the
>> wires 
>> that use to be part of the diodes.  The end of the capacitors all have
>> burned 
>> spots from the diodes that exploded.
>> Gary Weaver

The circuit is called a cascade voltage doubler , right ?
If this is what you mean, these are used in the triplers
in tv sets.
If I build one of these with 27 1uf caps  and 27 doides, from
a 220v supply I'd get 7500vdc on the output.
How much current can this supply ? can I use this
to power a tesla ? if so this makes things much simpler than using
an xf.
some of you guys reacted negatively on this so can someone
give a final answer, is this good or not ?
e-mail   -  kennetha-at-geocities-dot-com
homepage -  http://www.geocities-dot-com/SunsetStrip/8736/