Re: [TCML] High voltage diode sources

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi Jim,

I agree with Shannon. These diodes work well and for the low price, it 
is certainly a good idea to put a couple of these diodes in series to 
double the voltage rating. You don't want to run them at their max rms 
current and voltage ratings, so use a diode current rating well above 
your needs and double up on the voltage to make the diodes robust in the 
application.

Bart

Weinhold Shannon L wrote:
> I have a few ideas for ya -  
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=390033384391&_rdc=1
> These are 4 for $10, and have a 12kv .45 amp rating.  Super cheap
> shipping too. 
> I have used these for multiplier use and they hold up well. 
>
> And there's these, and you could double them up to get to the current
> rating of the caps you spoke of. 
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350160183443&_rdc=1
>
> I do recommend making diodes removable and thus replaceable in
> multiplier use. 
> I made the mistake of potting mine in epoxy with the capacitors and
> pulled some really killer sparks at 200,000+ volts...for a minute. :) 
> Potting the caps with attachment leads sticking out of the potting
> material, and soldering those leads to the diodes, followed by a
> generous coating of corona putty on the diodes and leads worked well for
> me. Ceramic doorknob caps worked excellent for me. 
> And don't forget that current limiting resistor on the output.  Sorry if
> any of that is redundant.
>
> Have fun multiplying! ;-)
>
>
>
>
> Shannon Weinhold
> Coffee Creek Correctional Facility
> Behavioral Health Services
> Mental Health Infirmary
> 503.570.6761
>
> "The problems of today cannot be solved by thinking the way we thought
> when we created them."
> -Albert Einstein
>
> -----Original Message-----
> From: Jim Harvey (UDN) [mailto:harvey.james@xxxxxxxxxxxxxxx] 
> Sent: Monday, March 02, 2009 10:06 AM
> To: 'Tesla Coil Mailing List'
> Subject: [TCML] High voltage diode sources
>
> Greetings,
> What high voltage diode would this group recommend? I am looking to
> build a three stage voltage multiplier driven by a 9000 VAC CT NST.
>
> I have found the X100SG diode from Voltage Multipliers Inc at a price of
> $5.29 each. This is a 10KV PIV 100 mA diode in an axial lead package.
>
> Any less expensive ideas?
>
> 73 & Stay Vertical,
>
> Jim Harvey (W7YV) - The Great Curmudgeon P.O. Box 18009 Salt Lake City,
> UT 84118 http://www.harveyclan.net http://www.harveyclan.net/w7yv.htm
>
> FIST # 13337
> SKCC # 3194
>
> "Calling CQ was like a box of chocolates. You never know what you're
> gonna get." 
>
>
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