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Registered Member #1824
Joined: Wed Nov 26 2008, 02:57PM
Location:
Posts: 7
im using a flyback transformer fbt 672 its an philips's fbt but ive never an arc :( what is the mean of 555 or something please some one help i dont know anything about fbts and im realy angry and sad :(
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Zenador wrote ...
See, that's kind of contradictory to what I understand. Ionized air conducts an electrical charge better than non-ionized air. Hence the quenching requirement on a SGTC. Removing the ionized air forces a break in the discharge, making the primary oscillate. No quenching can result in a constant arc, which means the electricity flows form the NST, MOT, or other PSU into the SG, that's the shortest path, at least on my build.
Try it for yourself, then. The gasses produced are ozone, maybe NOx, I'm not sure, but I think they have effect on teh breakdown voltage. This does not have anything to do with ionization, as the gas ionises only after the current started flowing. You may then require e.g. 50kV instead of 20kV to start the arc, and it would never start again.
Registered Member #1733
Joined: Thu Oct 02 2008, 03:17PM
Location: Hamilton, ON, Canada
Posts: 100
energytr wrote ...
im using a flyback transformer fbt 672 its an philips's fbt but ive never an arc :( what is the mean of 555 or something please some one help i dont know anything about fbts and im realy angry and sad :(
At the top of this thread, MadKaiser posted a link to his site for this build. There is a schematic diagram of the flyback driver. If you build that and use a decent 12V power supply (12V 1.5A is what I used initially) you should be able to pull about a 10mm arc. Don't use the flyback internal primary, wind your own around the exposed part of the ferrite.
Note: A 10mm arc is a lot of voltage and WILL burn things, including skin. Don't pull constant arcs from the ground pin on the xfmr, it will heat quickly and melt the plastic or epoxy holding it in place. Solder well insulated wire to the HV common and arc to that, but be warned that the insulation can melt too. I use long bolts as they can handle and dissipate more heat. Be careful... The desperation in your writing can be dangerous. Take some time and read up on what you are doing. There are hundreds upon hundreds of posts on flybacks, the required drivers, and associated uses. Being angry about it can lead to mistakes, and mistakes always have a price to be paid.
I spent a week reading up on what I was going to do, then another week building, and I'm still not done. Please take your time with this, no one here wants read about anyone getting burned or severely injured. Others will help you, but only if you are not going to pose a danger to yourself of others...
Registered Member #1733
Joined: Thu Oct 02 2008, 03:17PM
Location: Hamilton, ON, Canada
Posts: 100
Dr. Kilovolt wrote ...
Try it for yourself, then. The gasses produced are ozone, maybe NOx, I'm not sure, but I think they have effect on teh breakdown voltage. This does not have anything to do with ionization, as the gas ionises only after the current started flowing. You may then require e.g. 50kV instead of 20kV to start the arc, and it would never start again.
I'm not trying to be argumentative, just working it out logically. If my logic is flawed, so be it, I'm still new at this. So how about a happy medium, yes the pun was intended. If the medium was changed in the tube to a noble gas, yes, that would be a neon sign tube, do you think it would be able to sing? I guess I'm just looking for the best of both worlds, a singing arc that's not going to pose a danger to an audience. If I'm screwed, I'm screwed, I'll limit the runtime to a minute or less.
Registered Member #1824
Joined: Wed Nov 26 2008, 02:57PM
Location:
Posts: 7
thank you so much zenador but i exposed a 10 turns of feritte to my flyback and i made everything but nothing happening...no arc no voltage whats wrong?is there any internal primary on fbt im going to try it ones...just for see the arc but i didnt see it yet which pins im going to give voltage :(
Registered Member #1733
Joined: Thu Oct 02 2008, 03:17PM
Location: Hamilton, ON, Canada
Posts: 100
energytr wrote ...
thank you so much zenador but i exposed a 10 turns of feritte to my flyback and i made everything but nothing happening...no arc no voltage whats wrong?is there any internal primary on fbt im going to try it ones...just for see the arc but i didnt see it yet which pins im going to give voltage :(
10 turns on the primary is more than you need. I have 5 turns, 18AWG solid insulated wire. I wouldn't use the internal primary, mine won't handle the current needed for bigger arcs. What are you using for a power supply? If the current supply is too low, it may not be enough to drive the 555 and the flyback.
My current "hacked" bench supply is this one from Uzzors site. Uses a computer power supply. (Uzzors - if you read this - this supply is sooo handy.)
Use one 12V for the 555 driver, and one for the flyback. If it still doesn't work, the 555 or the FET may be dead. And the FET needs a heat sink. If you have any pics of your setup, please post them.
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Thurday late night audiomodulated flyback :D
I made one of those some time ago. You've got it looking very compact. The fan also looks very nice.
