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Registered Member #809
Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114
woooohooo, it's working, sort of. i found out that i had a 27kohm resistor instead of a 270hm, but i replaced it with a 22 ohm. Secondly (i feel so stupid about this one ) i put the power into the wrong pin of the transistor . i used the internal primary, and wound my own feedback, and i got a high picthed squealing noise from the flyback. i put the hv output near pin 7 and i got little sparks. now my question is how do you get bigger sparks? new feedback? new primary? more power!? oh, i ran it off 12v 4 amps
Registered Member #809
Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114
i just tried winding my own primary(5) on it next to the feedback(3), and i got 8mm sparks, they sounded like they were a higher frequency then i could really hear and were sputtery. i can only turn it on for a couple of seconds because the transistor gets very very hot, even on a little heatsink, i'll find a bigger one to put it on. what do you think i should do for bigger sparks? different primary?, new feedback?, more power (i don't really want to blow up my transistor yet)
EDIT: WOW!!!! i just took the feedback to 2 turns, and got massive 2cm sparks!!!!! woooohooo!!! is this right for a flyback on 12v 4 amps? YAY!! would i be able to add another transistor to increase power handling and decrease heat?
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Congrats I've never built one I also went straight to ZVS. adding another transistor I think would reduce the heat and it would help spread the load out more so you could put in more power.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Does anyone know which component inside the monitor can be used in place of the 2n3055? Uzzors' pic confirms it is possible, but can anyone tell me what markings it has or where it is in relation to the flyback? I know it will have a mounted heatsink, but there's a lot of heatsinked (heatsunk?) components in there.
I only ask because I have a few old CRTs (monitors and TVs) and because 2n3055s are way overpriced at radioshack.
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Flyback?
) i put the power into the wrong pin of the transistor 
. i used the internal primary, and wound my own feedback, and i got a high picthed squealing noise from the flyback. i put the hv output near pin 7 and i got little sparks. now my question is how do you get bigger sparks? new feedback? new primary? more power!? oh, i ran it off 12v 4 amps
I've never built one I also went straight to ZVS. adding another transistor I think would reduce the heat and it would help spread the load out more so you could put in more power.
