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LAN_403

Thu Jul 05 2007, 07:07AM

Registered Member #809 Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114

i have found one piece of vital info about this flyback, one of the pins on the side is connected to the capacitor!!. i found this out when i turned off the power, and went to adjust the windings, then i felt a tickling felling in my finger, so i grabbed the HV lead and put it near the 3 pins, that moment a 8mm fat spark jumped to the wire and it was loud!!!. lucky i know that now!!! i find that if i make a spark before i turn it off, the cap looses it's charge. i wonder if i can put a bleeder on it, or just remove the cap altogether, i do not want to touch it!! i gather these are dc right? what would be the right spark length for this driver?

uzzors2k

Thu Jul 05 2007, 08:31AM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

The transistor you're looking for is the HOT (horizontal output transistor), it'll be large and close to the flyback, often on the same heatsink/EMI barrier. Voltage rating will be 1000-1500V and current from 5-10 amps.

kv, you might want to upgrade to this driver.

I've found the sparks change appearance dependant of which of the diode/capacitor pins I short together.

Thu Jul 05 2007, 09:47AM

Registered Member #809 Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114

Uzzors wrote ...
I've found the sparks change appearance dependant of which of the diode/capacitor pins I short together.

so your saying if i short some of the pins on the flyback, i will get better output? i am going to change drivers within this or next week, the one you have mentioned, does it work better?

uzzors2k

Thu Jul 05 2007, 11:58AM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

Not necessarily better, but different. It seemed to connect an extra capacitor into the circuit. The sparks would take longer to fire, but they were much brighter. However I was using a 555 driver, which tends to spark more than arc, at least at low powers. I've never tried the circuit I posted, but it should work better. Also it only takes one more 2N3055 and a few windings, so it's not much work to construct.

Danielle

Thu Jul 05 2007, 07:08PM

Registered Member #632 Joined: Mon Apr 09 2007, 01:09AM
Location:
Posts: 267

building the ZVS power supply for the flyback is worth it get the transistors from ferchild as samples if you have a company. Yesterday I bet my friend I could build a louder noise maker with HV DC than a firecracker and using a old TV flyback and 12 bottle capacitors I made a constant stream of 6" fat DC arcs that were herd around the block. You should get a old TV flyback with no resistors and caps then you can have fun also build the ZVS. have fun

Thu Jul 05 2007, 11:26PM

Registered Member #809 Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114

thanks guys, i am going to build a better driver maybe next week or on the weekend, so i will get some bigger arcs and alot less heat. for now, could i add another transistor to help with heat and power handling?
this thing creats sooo much ion wind from the pins. i had a piece of tissue paper near the flyback, and when i turned it on, it blew the paper right off the table!! i think i will have to cut off the pins and fill it with resin or something. i removed the core spacers and now i can get 3cm arcs!!

Shaun

Fri Jul 06 2007, 03:41AM

Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616

Yea, thats why this makes such a great first-time project for anyone interested. Not only do you get long continuous arcs, but because the hv pins are very small in diameter (i actually sharpen mine!) you get a very directed ion wind that you can mysteriously blow stuff around with.

BTW if you have an SGTC, you can replace the power supply with the low-power flyback (not ZVS, too powerful). Mine only fires the gap at about 3 or 4 Hz, so you don't get resonance, but you can draw these neat little 4 or 5 inch Van de Graaff-type strikes. And they even feel like Van de Graaff strikes (That's right, you can touch them!). And the coolest is it only runs off a single 9-volt battery.

Fri Jul 06 2007, 03:48AM

Registered Member #809 Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114

so if i build a SGTC with this, would i get to air streamers?what kind of current output should i get with this? this thing leaks a hell of alot of carona around the pins, so i think i will cut some of them off and fill it. i was just playing with this thing and arcing it to water, and it puts a little dent in the water from the wind. i tried to make one of those high voltage lifters with my first ignition coil driver, and it didn't work, so finally i can try again YAY!! the strange thing is that the 5w resiistor is getting hot?

Danielle

Fri Jul 06 2007, 04:07AM

Registered Member #632 Joined: Mon Apr 09 2007, 01:09AM
Location:
Posts: 267

well about not using the ZVS for a SG tesla coil you should look at mine I got 6" arcs from a 5" coil I was running the zvs at 40v 6A. and yes you would get air streamers.

Sparrow338

Fri Jul 06 2007, 05:50AM

Registered Member #661 Joined: Sat Apr 21 2007, 03:17AM
Location: Ventura, CA
Posts: 41

I've had a lot of success with using a ZVS driven flyback as a SGTC power supply. I can get 6-7 inch streamers to air 8-9 inch arcs to ground running a DC flyback with a ZVS driver from 24 volts @ around 4-6 amps.

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