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TDU Microwave/Telsa prize

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Nik

Fri Sept 01 2006, 06:26AM

Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638

I grabbed the turntable motor for the secondary wire. It is so fine I would hazard a guess and say it is in the 36-40awg range. My calliper doesnt even register it (it is mechanical and accurate to ~1/100th on an inch). There is miles of the stuff so I might unwind and try again.

Ive noticed that alot of the parts I would normaly throw out look like they could become usefull in this project. Things like injencion molded plastic parts will be great for holding hv connections away form eachother.

Keeping in the spirit of microwave parts only I think I may attempt this with 0 outside parts. If I do end up resorting to anythign it will be hot glue to prevent connections from toughing eachother (if you look hard enough plastic stickers can even replace the glue).

Electroholic

Fri Sept 01 2006, 07:25AM

Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720

does it have to run for a long time?

how about a strip of plastic with screws on it as a spark strip.
like a multi gap, that way you wont' need a fan to quinch

and also the plastic sheets from the door can be rowed up for the secondary
might need a hot air gun for that tho.

main problem would be teh cap... hummmm
doubler -> inductor -> plastic parallel plate cap?

Nik

Fri Sept 01 2006, 07:43AM

Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638

Im going to take TDU's hint and get my hands dirty for the cap. This also means I won't be using a doubler, I hope it works.

Tesladownunder

Fri Sept 01 2006, 11:23AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

nik282000 wrote ...

my secondary wire snapped. I wonder if there is anything in the microwave that can be used to cover a splice...

Mine too. Hotglue it.

Wilson wrote ...

..I think the secondary would be the most challenging....seeing as you have to make ur own former...

Its a challenge but there are a few materials available to you. There are TC secondaries without any former after all.

Electroholic wrote ...

does it have to run for a long time?
..might need a hot air gun for that tho.
main problem would be teh cap... hummmm
doubler -> inductor -> plastic parallel plate cap?

It has to last long enough to get the best photo. And you may want to keep it as a display piece.
Hot air gun or a big dollar CNC machine is OK to work on it.
The caps are feasible otherwise I wouldn't have proposed this.

Has anyone thought of a microwave excited TC? (is there such a thing)

Peter

Marko

Fri Sept 01 2006, 11:27AM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Has anyone thought of a microwave excited TC? (is there such a thing)

Secondary of such a TC would end like piece of short wired , and would have such a low Q factor thatit couldn't be called a TC anymore.

Besto would be just to try setting it at quarter wavelength of microwave frequency and hoping it to spew some small streamers just from antenna nffect.

If one had a magnetron or klystron operating at few tens of Mhz maybe it could exscite a small TC secondary, but size difference would still be funny..

Tesladownunder

Fri Sept 01 2006, 11:42AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

I should add a safety note. MO's are extremely dangerous compared to NST's. You must really be careful with these. At a minimum you should keep the interior light active to indicate the power is on and make a rule of never touching it unless the power cord is draped across the top.

Peter

Self Defenestrate

Fri Sept 01 2006, 01:02PM

Registered Member #87 Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191

This is a great challenge, TDU. If I can locate a microwave, I'm definetly in. If I were me(wich I am), I'd be on the lookout for a non-digital microwave that has a real bell inside. Not suggesting what it should be used for on this toroid-less coil, but it could be usefull.

Marko

Fri Sept 01 2006, 01:03PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Bells are another great source of wire too..

Reaching

Fri Sept 01 2006, 02:02PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

you can build a nice plate capacitor by using the cases metal and the front glass plate, this thing should have some 500pf or so and a high enough voltage rating. use a pvc former with a sheet of paper around it and wind your secondary with wire from the motor or the bell or the small rotating disc motor, then coat it with something and remove the former, voila a very good secondary without any former,. you can use the remaining parts of the bell for a toroid and the top of the MO can act like a base to build the tc on .use bolts for the spark gap and when you still have a working fan then use it to quench the gap. the primary can be build out of the power chord cable or out of the cables inside the MO.hehe and you can build a dc resonant tc too, use the MO cap and the diode to build a 1phase voltage doubler, then the plate cap and the spark gap, that should perform much better

nice project, but i only have one working MO okay its an old one but i use it to heat up my acid for pcb making etc so i wont cut it in pieces

GimpyJoe

Fri Sept 01 2006, 08:14PM

Registered Member #316 Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212

Reaching, I don't know if coating the secondary fits with the zero cost thing. I think the best thing in a MO for a secondary former would be to cut a piece of the plastic that guides the air from the fan and use a heat gun to bend it. Then you would still have the big piece of plastic from the door to make a capacitor.

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