High Voltage Diodes

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: High Voltage Diodes
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Mon, 2 Mar 1998 23:42:31 -0600
• Approved: tesla-at-stic-dot-net

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From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Sunday, March 01, 1998 3:28 PM
To:  Tesla List
Subject:  Re: High Voltage Diodes

Hi Roderick, all,

> From:  RODERICK MAXWELL [SMTP:tank-at-magnolia-dot-net]
> Sent:  Saturday, February 28, 1998 12:15 PM
> To:  tesla-at-pupman-dot-com
> Subject:  High Voltage Diodes
> 
> I have four 15Kv-at-750ma microwave oven diodes that I plan on using in a
> Dc supply for my new tesla coil. When I test them with my ohm meter they
> all read infinite resistance even when I reverse the leads. Is this a
> property of high voltage rectifier diodes??? These are new diodes that
> have not even been used in a circuit yet. All of my experiance has been
> with the lower voltage variety. If anyone has used these type of diodes
> before, HELP!

Unfortunately it is. EHT diodes use stacked junctions that have a 
considerable total forward voltage drop that mos multimeters can't 
handle. I measured Vf around 6V in some 20kV diodes once.

Malcolm

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