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Re: 12KV 750Ma diodes

Original poster: "Steve Ward" <steve.ward@xxxxxxxxx>

Hi Matt,

What do you suppose is on the inside of the HV diodes?  Its just a
string of diodes potted in epoxy, so the power dissipation (compared
to a string of diodes) is very similar as the forward voltage drop
will be similar.  At least an exposed string of diodes will have the
possibility of dissipating more power (depending on design technique)
than a HV diode thats entirely encapsulated.

Steve

On 4/9/07, Tesla list <tesla@xxxxxxxxxx> wrote:

Original poster: Mddeming@xxxxxxx

In a message dated 4/9/07 2:57:58 A.M. Eastern Daylight Time,
tesla@xxxxxxxxxx writes:
Original poster: G Hunter <dogbrain_39560@xxxxxxxxx>

Here's a pair of 14kv 1000ma diodes:

http://cgi.ebay.com/HV-Rectifiers-14KV-1-Amp-Set-of-2-HV-Diodes_W0QQitemZ130095517214QQihZ003QQcategoryZ48708QQrdZ1QQssPageNameZWD1VQQcmdZViewItem

You can also roll your own by soldering twelve, 1N4007
diodes in series.  This will give you 12kv at 1000ma
for under $1.

Greg


Hi Greg,

Perhaps this is not a problem, but I have always been concerned about
the power dissipated in long strings of small diodes. Even a few
volts each, times a dozen or  more diodes, times an amp can generate
some heat. This is probably why I've seen strings of diodes on boards
in oil for some X-ray units. What has your experience been?

Thanks,
Matt D.




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