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'[EE]Looking for components'
2008\04\20@082042 by cdb

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I've been asked by someone in Brazil to source a very small quantity
of very high VRRM fast recovery diodes, namely something along the
lines of a BY711/BY8418/SHV-24.

The specs required are VRRM 17KV min @ 3mA, the man foolishly wants to
build an Electro-static power supply for this -

www3.telus.net/chemelec/Projects/Electrostatic/Electrostatic-Sc
h.png

The normal suspects (Farnell, RS Components) just about stock
microwave oven diodes and go no higher - Mouser doesn't go above 2KV
and Digikey catalogue is a nightmare, but appears not to stock them.

Vishay - drawn a blank
Infineon - ditto
Zetex - ditto.

I've Giggled for them, but just end up with datasheet servers.

If anyone has alternative part numbers with these specs, I could hunt
aorund for them.

Thanks

Colin



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cdb,   20/04/2008

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2008\04\20@090342 by sergio masci

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On Sun, 20 Apr 2008, cdb wrote:

{Quote hidden}

Hi Colin,

Try searching on ebay for high voltage diodes.

Regards
Sergio

2008\04\20@090641 by Rolf

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Reading that link, the author says:

"I can supply all these parts, if required."

Have you considered contacting the author? He has them for sale here:

http://www3.telus.net/chemelec/Parts/HV-Diodes.htm

Rolf

cdb wrote:
{Quote hidden}

2008\04\20@091212 by cdb

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:: Hi Colin,
::
:: Try searching on ebay for high voltage diodes.
::
:: Regards
:: Sergio

Hi Sergio,

It never occurred to me to look on Ebay, and yes I see Hong Kong is
trying to sell high voltage diodes for Tesla machines.

Thanks

Colin


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2008\04\20@092913 by cdb

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:: Reading that link, the author says:
::
:: "I can supply all these parts, if required."
::
:: Have you considered contacting the author? He has them for sale
:: here:

Yes, apparently he is not keen to post to Brazil, will only take US$
does not accept PayPal and will not guarantee delivery.

The person who has asked me to supply them I've dealt with before, and
he trusts me to deliver, even with the extra postage of Australia to
Brazil.

Colin
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2008\04\20@101826 by Sean Breheny

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Hi Colin,

Sorry, I can't help with a source for the diodes but I am curious: why
do you say this is foolish? Because of the danger? The schematic in
the link you sent is the power supply itself, not the device it is
intended to be used for (which sounds like it is some kind of air
filter)

Sean


On Sun, Apr 20, 2008 at 8:20 AM, cdb <EraseMEcolinspam_OUTspamTakeThisOuTbtech-online.co.uk> wrote:
>
>  The specs required are VRRM 17KV min @ 3mA, the man foolishly wants to
>  build an Electro-static power supply for this -
>
>  www3.telus.net/chemelec/Projects/Electrostatic/Electrostatic-Sc
>  h.png
>
>

2008\04\20@110149 by Apptech

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> Sorry, I can't help with a source for the diodes but I am
> curious: why
> do you say this is foolish?

Many kV :-)

? Because of the danger? The schematic in
> the link you sent is the power supply itself, not the
> device it is
> intended to be used for (which sounds like it is some kind
> of air
> filter)

Filter

       http://www3.telus.net/chemelec/Projects/Electrostatic/Electrostatic.htm

Sounds like he may know his stuff.



       Russell


>>
>> www3.telus.net/chemelec/Projects/Electrostatic/Electrostatic-Sc
>>  h.png

2008\04\20@142423 by Ruben Jönsson

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Hi,

Hitachi has HV diodes up to 14kV
<www.pi.hitachi.co.jp/pse/product/diodes/2006316_14592.html>
I have successfully replaced the now obsolete BY8410 with DHM3J120.

VMI has up to 20kV
<http://www.voltagemultipliers.com/html/selection_guide_hv_diodes.html>

HVAC is another possibility with diodes up to 30kV.
<http://www.hvca.com/pg_catalog/catalog.aspx>

/Ruben


{Quote hidden}

> -

2008\04\20@200841 by Apptech

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"LASER" copiers / printers us an electrostatic generator.
Some units, perhaps from larger commercial copiers, have
output voltages of many kV. Mayhaps using one of these could
be an attractive solution? Given the typical cost of spare
parts for most equipment, maybe not.


       Russell

2008\04\21@062805 by cdb

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part 1 897 bytes content-type:text/plain; charset=us-ascii (decoded quoted-printable)

Well Sean,

It's very high voltage electrickery, and I'm reasonably certain he doesn't have the nohow about spacing or build quality of a such a device, not sure how he intends to make the filter itself.

In fatc typing this has just reminded me I must ask him where he intends to place this machine - he's a mushroom farmer and purchased my humidity controller for his hut - if he intends to place it there - conformal coating sounds like a good idea.

:: why do you say this is foolish?

Colin

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2008\04\21@062859 by cdb

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Thanks I'll look into those.

Colin

:: Hitachi has HV diodes up to 14kV
:: <www.pi.hitachi.co.jp/pse/product/diodes/2006316_14592.html>
:: I have successfully replaced the now obsolete BY8410 with DHM3J120.
::
:: VMI has up to 20kV
::
<www.voltagemultipliers.com/html/selection_guide_hv_diodes.html
:: >
::
:: HVAC is another possibility with diodes up to 30kV.
:: <http://www.hvca.com/pg_catalog/catalog.aspx>

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2008\04\24@113644 by Carl Denk

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Honeywell electrostatic air filters have a pair of high voltage (30KV??)
diode. If needed in a hurry, try your local furnace parts house.

Ruben Jönsson wrote:
{Quote hidden}

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