Re: MOT supply

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Hydrogen18" <hydrogen18@xxxxxxxxxxxxx>

You dont need 240 vac for a 4 pack, it will run happily at lower power
levels with 120 vac input. The wiring is only slightly different. As Greg
said, current is not something you really need to worry about. Most MOTs
from 900 watt ovens or larger are capable of a 3 amp short circuit current
or more, not that they will survive long at those currents. If you have a
10000 volt NST you can wire it up on the output of the 4 pack stack to
determine the output voltage of the 4 pack.

If you want to see how I insulated my MOTs from their cores you can look
here:
http://www.hydrogen18.com/projectlogs/hivolt/4packmot/

I have a strong feeling your name doesnt rhyme with "Huge Ass" btw. Where
are you located? Maybe a coiler in your region can help you some.

Eric
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, December 18, 2004 11:14 PM
Subject: Re: MOT supply


> Original poster: hue jass <chesscactuar@xxxxxxxxx>
>
> I would like to make the MOT four pack, but I dont have any 240vac wall
> plugs. Is there any way for making an MOT supply.
>
> Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: Gregory Hunter
>
> I agree. The twin MOT supply with voltage doublers is
> a rig job. A 4 pack of MOTs in series will yield a
> simpler, more powerful, and more reliable power
> supply. If you can scrounge 3 more MOTs, that's the
> way to go.
>
> Sure, the twin MOT thing works for me. By trial and
> error I managed to find a Tesla coil, tank cap, spark
> gap, and twin MOT supply that play well together.
> Unfortunately, many coilers have trouble getting their
> voltage-doubled twins to work properly. The most
> common complaint is blown diodes. The second most
> common complaint is doubler cap failure. The third
> most common complaint is poor performance. The results
> I displayed on my web site should not be considered
> typical.
>
> For one thing, I am an experienced electronics
> technician & troubleshoote r. For another thing, I
> spent years gaining practical experience with NST
> coils before I started messing with MOTs. In other
> words, I had a solid foundation to build on plus the
> time, skills, and resources to work out the bugs.
> Newbies who tackle a twin MOT supply for their
> first-ever Tesla coil project are courting
> disappointment.
>
> Twin MOTs with doublers should be considered "the
> power supply of last resort" for those who are simply
> to poor to scrounge for NSTs, or for those who live in
> countries where NSTs are nearly impossible to obtain.
>
> Having let all that sunshine into your day, I'll take
> a whack at your original question. I've gutted a large
> number of dead ovens, and I can say with some
> confidence that you may use your cap rating as the MOT
> output. Since your oven came with a 2100WVAC (working
> volts AC) cap, then it's a safe bet your MOT puts out
> about 2100VAC. If you need more certainty, then apply
> 120vac wall current to your secondary and read the AC
> volts on the primary. This will provide the exact
> turns ratio. Current? Harder to say. You can short out
> the secondary with an ammeter and read it, but this is
> hardly a realistic load condition. My best advice is
> not to worry about it too much. Even a smallish pair
> of MOTs puts out ample current for hobby-level
> coiling. If you can find another MOT like the one
> you've already got, you're in business.
>
> Best Regards,
>
> --- Tesla list wrote:
>
>  > Original poster: "Hydrogen18"
>  >
>  >
>  > Given the availability of of MOTs and the problems
>  > encountered with using
>  > the doubler I suggest you just try and find 3 more
>  > MOTs and make a 4 pack.
>  > You will need to remove the HV connection to the
>  > transformer core and
>  > connect it to a suitably insulated wire(ignition
>  > wire or neon sign wire) and
>  > then in sulate that with epoxy. A fifth MOT with its
>  > secondary shorted can be
>  > used as a ballast. It isnt particularly difficult to
>  > wind a suitable
>  > inductor either.
>  >
>  > ---Eric
>  > ----- Original Message -----
>  > From: "Tesla list"
>  > To:
>  > Sent: Friday, December 17, 2004 8:03 PM
>  > Subject: MOT supply
>  >
>  >
>  > > Original poster: hue jass
>  >
>  > >
>  > > Hello! I am planning a new 4" coil, and i am
>  > limited on budget. I want to
>  > > make one of Greg Hunter's dual MOT supply with
>  > doubler. I already have an
>  > > MOT, but i dont have any idea how much voltage
>  > and current it can put out.
>  > > Also, my microwave cap is rated .65 mF at 2100KV
>  > AC. I can find the
>  > diodes,
>  > > caps, and resistors, but i need to know the if
>  > voltage of my MOT is enough
> &gt
> ; > and if the capacity of my cap is enough.
>  > >
>  > > thanks
>  > > Blake
>  > >
>
>
>
> =====
> Gregory R. Hunter
>
> http:\\hot-streamer.com/greg
>
>