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Registered Member #627
Joined: Thu Apr 05 2007, 04:05PM
Location: London
Posts: 32
OK, heres what happened. I wired it all up, and nothing. Changed the primary wired round the other way, and it makes a high pitch whine, but no arc. Although there is some high voltage on the output, enough to light a neon with just one wire attached :)
Heres a pic, im not sure where to go from here. Maybe build a better driver circuit. (Currently using the 2N3055) and maybe a better flyback?
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
If the coil whines, it usually means the coil has shorted out, at least in my experience, secondly it looks like ur using the the flybacks internal windings if you are DOn't those use 120v to produces the HV out, instead take some wire you have laying around and wind it around the exposed core where the clip is, 3rd I imagine you've tried it but try measuring from the HV out put wire to any of the other pins, with power off of course, just so you get an idea of how the and where and what the terminals are connect to.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
hi, try a better driver, do a search for "zvs flyback driver", you will need to wind your own primary of 5+5 turns. If after building this driver, you get no HV then for sure your fllyback is toasted.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
The flyback should be fine, but fix your driver. I used the exact same driver setup as you for my first flyback driver, internal windings and all. Powered off a 9V battery it gave pathetic 3kV sparks. I went directly to the 555 driver from there, which was a great improvement. However if you want quick results wind your own primary and feedback windings. Try 3 turns for the feeedback winding and 5 turns for the primary. If it fails to oscillate reverse the windings until it works. The ZVS driver is also easy and fun. Try the 555 driver for high voltage low current sparks or the ZVS for flaming high current lower voltage arcs.
Registered Member #528
Joined: Fri Feb 16 2007, 10:32PM
Location: Warsaw, Poland
Posts: 166
uzzors wrote ...
The flyback should be fine, but fix your driver. I used the exact same driver setup as you for my first flyback driver, internal windings and all. Powered off a 9V battery it gave pathetic 3kV sparks. I went directly to the 555 driver from there, which was a great improvement. However if you want quick results wind your own primary and feedback windings. Try 3 turns for the feeedback winding and 5 turns for the primary. If it fails to oscillate reverse the windings until it works. The ZVS driver is also easy and fun. Try the 555 driver for high voltage low current sparks or the ZVS for flaming high current lower voltage arcs.
Registered Member #567
Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
Ummm. I would imagine he refers to the generic 555 driving a MOSFET circuit.
Sparkie, before you do anything else, I have a reccomendation. Don't use a 2n3055, those are pathetic for DC flybacks, no idea why. Use another transistor- the 2N3773 works ok, the KJE13009, very well.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
For sure. I haven't updated anything for a while, and I have many other flyback drivers. I made this one recently, and it gives good sparks and arcs, tested up to 50V.
Registered Member #627
Joined: Thu Apr 05 2007, 04:05PM
Location: London
Posts: 32
Thanks everyone!! I did what whitearc said, and made my own windings, and it works! I put a little video on here. Thanks a lot to everyone here! Now im building it all into a neat box, 12v in HV out :) Ill post more once its all finished.
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Is this flyback suitable?
