Look in the "Free" section of Craigslist. People are constantly giving away broken microwave ovens. I have salvaged so many that I don't even pick them up anymore. Incredibly, a lot of them just have a blown fuse.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "undisclosed recipient via Tesla" <tesla@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, July 15, 2019 7:20:53 PM
Subject: Re: [TCML] microwave oven caps
I am one short of .5Uf 2100 volt cap I got from Bob L. at UI a few years ago. And I can’t find them on line.
So I’m figuring a bandaid just to add that extra cushion to get two strings running to feed the primary.
> On Jul 15, 2019, at 16:45, jimlux <jimlux@xxxxxxxxxxxxx> wrote:
>
> On 7/15/19 2:38 PM, Rinner wrote:
>> "For a voltage doubler at line frequency, though, they work just fine."
>> That thought scares me :)
>
> Well, that is their design intent - microwave ovens are basically a half wave doubler, with the second diode formed by the magnetron.
>
> I've seen people build fairly impressive stacks (10 stages) of microwave oven diodes and capacitors - the challenge is that if you suddenly discharge it (like you draw a spark from the top of the stack), you often destroy a bunch of diodes, because of the high peak curent.
>
> So a good experiment if you have a lot of cheap HV diodes.
>
>
>> On Mon, Jul 15, 2019, 4:16 PM jimlux <jimlux@xxxxxxxxxxxxx> wrote:
>>> On 7/15/19 11:36 AM, undisclosed recipient via Tesla wrote:
>>>> Has anyone used microwave caps as they are around 2100 volts each?
>>>> If not, why?
>>>>
>>>
>>> They're designed to filter line frequency (50/60 Hz) and have high loss
>>> at 100kHz+ TC frequencies. Most also have a bleeder resistor built in
>>> that is parallel to the capacitor.
>>>
>>> For a voltage doubler at line frequency, though, they work just fine.
>>>
>>>
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