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aris

Sat May 22 2010, 06:57PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

I want to make a TC but i havent a nst power supplier so i wanderd if i can use a flyback transformer from my old color tv.I want to make an entry level TC if i can use a fbt it will be cool?Also the FBT must have diode and what is diode(i am a little noob!),be AC or DC?.One more question is if i can use little disc blue ceramic capacitors (14kv 0,001uf).It will be ok?

Sorry for my english!I am looking forward for your answers!

803

Sat May 22 2010, 07:24PM

Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
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Posts: 191

A diode rectifies ac, ie it turns ac into dc
A fbt will work fine, just that you will wasnt to look at other dc tcs use rich's site for info [link]
The csrematic caps will work poorly, they will 1. not be able to handle the high voltage of the fyback(30kv+) 2. will not stand the high currents of the tc(hundreds of amps) and 3. won't handle the high hzs of the tc(100 of khz)

If you don't know what a diode does, I sugect learning more before make a deadly tc, I spent over 2 years learning.

Good luck,

Paul:-D

aris

Sat May 22 2010, 09:21PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
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Posts: 81

I think to make a MMC with ceramics capacitors..thats will be fine?Also i must provide tesla coil with ac or dc?

Mads Barnkob

Sat May 22 2010, 09:43PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

A flyback transformer can certainly be used for a small spark gap tesla coil, here is a link to my first:

Ceramic capacitors will work provided that you series enough to withstand your supply voltage, 3 in series would give some overhead to a flyback transformer, its just a matter to put together a MMC that will work with your primary coil to fit the resonant frequency of the secodary circuit.

Ceramic capacitors will not be optimal, but neither is homemade saltwater capacitors as I started with, with short runtimes they should not overheat into destruction, the peak amperage in a flyback driven tesla coil is not in the destructive end of the scale. Frequency of operation will at higher values give higher losses, more heating. If it is not heating violently and you are happy with your spark output, its fine.

A color tv flyback is most likely to already be rectified from its internal diode chain tapped up through the coil of the flyback transformer.

Bottomline is: This works, its just a matter of desired efficiency and performance.

803

Sat May 22 2010, 09:43PM

Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
Location:
Posts: 191

i sugest reading the hv wiki on the left to pick out your cap. A tc can work with dc or ac as I've said use rich's site to leran more

ScotchTapeLord

Sat May 22 2010, 11:37PM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
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Posts: 635

803 wrote ...

A tc can work with dc or ac as I've said use rich's site to leran more

It's true that you can run a TC off DC or AC, but for a flyback running at several kHz, you must use DC due to the tiny amount of energy per cycle from the HF supply. A flyback transformer just can't fill a suitably large tank capacitor up in, for example, 1/20000 of a second.

All the AC coils I've seen run from mains frequencies, either 60 or 50 Hz, right straight from the output of a good old iron transformer.

aris

Sun May 23 2010, 04:36PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

The bottom of the secondary coil must be connected to the ground right?Î¤he top of the coil must be connected to the toroid or the toroid is a separate part?Also the ground must be the ground of the house or a metallic structure?(If you could tell me some details about the ground of the secondary coil i would be happy:P)

quicksilver

Sun May 23 2010, 06:05PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

Mads Barnkob wrote ...

A flyback transformer can certainly be used for a small spark gap tesla coil, here is a link to my first:

I always smile when I see your page because your 1st one and mine looked the same - right down to the bottle cap. --- Hey, if it works; you learn, right?

aris

Mon May 24 2010, 11:03AM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

Can someone answer to my questions please?:P

Mads Barnkob

Mon May 24 2010, 11:26AM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

aris wrote ...

Can someone answer to my questions please?:P

Maybe it is not getting answered because you should have found out yourself:

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