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need help building own flyback

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LAN_403

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Wed Feb 04 2009, 03:28AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

That is why you use the aquarium sealant (one would hope it isn't leeching too much acid into your fishtank!)

Although really acetic acid really isn't all that corrosive, in most applications the corona/ozone that is probably also in the vicinity would do a lot more damage than some acetic acid floating around (especially since you can't get the pH of acetic acid below 2-3 regardless of how well you concentrate it)

Proud Mary

Wed Feb 04 2009, 04:33AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Food grade vegetable oils as sold in supermarkets are excellent dielectric materials, and are now widely used as an environmentally friendly, biodegradable alternative to 'mineral oil' in high voltage power transmission transformers, many of which are now being modified to accept vegetable seed oils. Rapeseed oil and sunflower seed oil are both suitable.

If you are concerned over long stability (years) you can treat the oil with zeolite. However, in order to ensure a long shelf life and crystal clarity in the consumer bottle, kitchen sunflower seed oil, for example, has already been refined to a high degree of purity and stability. It is commonly used to fry with without significant fire risk.

Vegetable seed oils have been used to good effect by members of this forum, and there is no good reason nowadays for anyone to use environmentally harmful 'mineral oil' in HV work.

See for example only:

and

teravolt

Wed Feb 04 2009, 04:34AM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

I use perifin or candle wax to insulate but oil is exalent. the advantage of perifin is less mess. diala aka transformer oil is prefered but I think that you could use minral oil from the grocery store. any boy feel free to correct me

Duality

Wed Feb 04 2009, 03:19PM

Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105

oil (vegetable) it's going to be then

Duality

Mon Feb 16 2009, 06:31PM

Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105

should i put the home brew flyback in a bottle and such a vacuum on it?

Myke

Mon Feb 16 2009, 08:09PM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

putting on a vacuum would remove all the air bubbles which helps with the insulating of the oil. You would need to put it in a bottle that can hold that vacuum. Also you might want to have some sort of trap so that oil can't go back into the pump if something bad happens.

Arcstarter

Mon Feb 16 2009, 11:37PM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

You can just pull a vacuum once, and let is sit for awhile. Then you can let the vacuum off, and it will be alright. But do NOT let the transformer hit air, or it could get air in between the windings and it would have to be re-vacuumed. This is infact how they make pole mount distribution transformers. they mount the transformer in the can and do all that good stuff, and then they poor the mineral oil in, vacuum, and let the pressure out then seal the can. I know this because i have seen videos of them being made, and when i pull the pressure release valve, no air goes in.

Duality

Thu Feb 19 2009, 12:16PM

Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105

should i use maximum turns on primaire to test,
and then go slowly down to less?

Plasma Lover

Thu Feb 19 2009, 07:55PM

Registered Member #1911 Joined: Mon Jan 05 2009, 06:30PM
Location: Salem, Oregon, USA
Posts: 165

R v.d. Tuuk wrote ...

should i use maximum turns on primaire to test,
and then go slowly down to less?

You shouldn't use maximum turns, unless you're looking for high voltage. If your secondary coil wire is thick, do maximum primary turns to start with, but if it's very thin, do, say, six turns rather than ten. You have to play around because, with home-wound transformers, you never know what you're gonna' get.

Duality

Thu Feb 19 2009, 08:10PM

Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105

at the moment i have ten turns,
it is little bit thick wire on the secundary,

hello,
i hooked up my home-brew fly-back and guess what :P i had first light butt not for long :(
it draws so much current that every thing blows up
i think i need other driver then my ne555 based any suggestions?
could a zvs be a possibility?

[Edit: corrected double post]

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