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Re: power supply options

Original poster: "Hydrogen18" <hydrogen18@xxxxxxxxxxxxx>
I really can't say what I did with my filament windings in all honesty. From the looks of it they are still there. The transformers are tucked away in the back of the garage in the podium in a very hard to see spot, so I can't verify easily. I'll have to try and see if I can check next time I run the coil.
My transformers arced pretty badly and werent functioning well afterwards. I scraped all the carbon tracks off with a knife. If you look, what I did was removed the secondaries connection to the core on the outer transformers(no need to on the 'base' ones) and then soldered it to some wire rated to 30000 volts. I then put masking tape over the side of the secondary and epoxied this to the secondary. This has two purposes. The masking tape absorbs the epoxy holding the solder joint down, creating an insulator so it doesnt arc back to the winding and strengthening it mechanically. I also allowed epoxy to flow down where the secondary wire emerged from the core in order to add more insulation. I then put epoxy all around where the primary wire is near the outside of the core. The HV would not jump through the paper around the winding, but instead tracked along it till it reached the enamel insulation of the magnet wire and penetrated it. This treatment cured all of my problems, without the complications or messiness of oil. Send me some pictures of your MOTs off list and I'll suggest where I'd add insluation etc. 

Eric
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, April 24, 2007 10:14 PM
Subject: Re: power supply options



Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>

Eric,
How can you use your MOTs after they've started to arc over to their core? Do you put in more insulation somehow? I've just been swapping out the old MOTs with new ones, I didn't know you could fix them. Do I have to remove the filament winding, or just clip it off (like I've been doing). 
Thanks a bunch.
Scott Bogard.



From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: power supply options
Date: Mon, 23 Apr 2007 22:46:27 -0600

Original poster: "Hydrogen18" <hydrogen18@xxxxxxxxxxxxx>
I'd have to agreed with Jon. I've got 'smallish' MOTs and have gotten them so hot I couldnt touch them, arced over core to the primaries from floating the core at above ground voltage, etc. and I'm still on the same original four. You can see what I've done with them here: 

http://www.hydrogen18.com/projectlogs/hivolt/HV_pwr_center/
newest stuff is at the bottom of the page. Of course mine are theoretically 'premium scrap' as I bought them from a microwave oven recycler(was 12 or so at the time, couldnt go exploring to find junk). But I've pulled MOTs that looked IDENTICAL to these from units I've found 1/2 buried in mud and they worked just as well. 

Eric

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, April 23, 2007 1:26 PM
Subject: Re: power supply options



Original poster: "Jon Danniken" <danniken@xxxxxxxxxxx>

Original poster: "Scott Bogard"
Right now I am using MOTs, which are free (which is very good), and they put out lots of power (which is also good) but they do indeed occasionally burn out, and my supply is dwindling faster than it is growing.
Scavenge some more microwave ovens. Call up all of the appliance people in your area and ask them for the broken ones, scour craigslist and freecycle for old ovens.
Persistance pays off, plus you get cool magnets and other stuff, fuseholders, microswitches, relays, et cetera. 

Jon





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