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CW multiplier diodes

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teravolt

Thu Feb 17 2011, 08:33PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

Hi bwang I used standard 1n4007's with doorknob for my dubbler hear is the thread that I used them on. uf4007 would be a better choice if you can get them cheaply

James

Thu Feb 17 2011, 09:33PM

Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506

There are at least 5-6 manufactures of HV diodes, but it can be hard to find distributors. A few of them will sell parts directly if you contact them. As far as cheap diodes, the selection is limited but OT Electronics has the best prices I've found. They have all sorts of caps too.

jpsmith123

Thu Feb 17 2011, 10:41PM

Registered Member #1321 Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843

I think OT electronics is the web site of the guy (from China) who sells the same stuff on ebay. I think it's the same stuff as sold by HVCA, but I could be wrong.

I know there used to be other manufacturers of HV diodes (i.e., over 1 kv, fast recovery types), but when I search nowadays, I see no evidence of any other manufacturers. (There's a company called Semtech that might be manufacturing them but I'm not sure if they still do).

Can you tell me, who are some of these other manufacturers?

Xray

Fri Feb 18 2011, 06:27AM

Registered Member #3429 Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288

jpsmith123 wrote ...

Can you tell me, who are some of these other manufacturers?

Check out this

company. They also have an interesting tutorial about how hv diodes are designed and manufactured on their website!

James

Fri Feb 18 2011, 06:29PM

Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506

jpsmith123 wrote ...

I think OT electronics is the web site of the guy (from China) who sells the same stuff on ebay. I think it's the same stuff as sold by HVCA, but I could be wrong.

I know there used to be other manufacturers of HV diodes (i.e., over 1 kv, fast recovery types), but when I search nowadays, I see no evidence of any other manufacturers. (There's a company called Semtech that might be manufacturing them but I'm not sure if they still do).

Can you tell me, who are some of these other manufacturers?

It is the same stuff as on ebay, but it's a bit cheaper to buy directly than to buy on ebay since he doesn't have to pay the ebay fees.

I found several companies when I was searching a while back. VMI is one of them which someone else has mentioned, I wish I could recall the others.

Proud Mary

Fri Feb 18 2011, 06:45PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

I've bought from OT Electronics on ebay over several years, and found them honest and reliable.

quicksilver

Fri Feb 18 2011, 10:32PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

I have also bought from OT and agree 100%. Their same products are marked up by others however and I would much rather deal with them for more than simple monetary reasons. They are uniquely honest.

jpsmith123

Tue Mar 01 2011, 11:42PM

Registered Member #1321 Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843

Well I checked out VMI's prices on a few diodes, and they're simply outrageous...breathtaking, even.

It looks to me like there are basically only two options for anyone with a finite amount of cash: (1) string together tens-to-hundreds of 1 kv diodes; or (2) buy something from OT Electronics.

One benefit of stringing together bunches of 1 KV diodes, is that you apparently end up with a very electrically-rugged CW multiplier that needs no series resistors for protection. (Or at least, that's the impression I got from looking at the video that Uzzors put up on youtube, wherein he draws some nice hot arcs from his resistor-less multiplier, with no problems at all).

Unfortunately though, I don't have the patience to solder hundreds of diodes togethet.

Although I have some 2CL2FM diodes, being that I cannot find any inexpensive, electrically and physically suitable epoxy and/or RTV for encapsulation, I'm not going to use them. Instead, I think I'm going to get some 10KV, 1A diodes from OT Electronics.

OT's 10KV 1A diodes are physically big enough that they should be able to operate at full voltage in the open air. Moreover, the relatively large physical size of these diodes may facilitate the use of some kind of improvised heatsinks for better cooling.

Hopefully, these diodes, with their 1A rating, will be electrically rugged enough that they will need only some small series resistors for protection (if they need any at all).

Xray wrote ...

jpsmith123 wrote ...

Can you tell me, who are some of these other manufacturers?

Check out this

company. They also have an interesting tutorial about how hv diodes are designed and manufactured on their website!

Inducktion

Tue Mar 01 2011, 11:51PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Yeah, I was similarly wondering the same thing.

Something like those, look great and are a pretty decent price. The only downfall is paypal, which stinks. If you string enough of those diodes together you could make a pretty nice multiplier. Now all I need are caps....

*goes off murmuring about money*

jpsmith123

Wed Mar 02 2011, 04:49PM

Registered Member #1321 Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843

I see another potential candidate diode for use in a multiplier: a Vishay RGP02-20E.

These are 2 kv diodes but they're a little slower (300 nS) and a little less rugged (Max Avg If = 0.5A, Ifsm = 20A) than a UF4007.

I see them priced from 0.10 to 0.17 each or so depending on quantity.

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