Flyback issues... I THINK / High Voltage / Forums

Forums

4hv.org :: Forums :: High Voltage

« Previous topic | Next topic »

Flyback issues... I THINK

previous 1 2 3 4 next

Move Thread

LAN_403

twist2b

Tue Apr 21 2009, 11:09PM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

Antonio - agreed, thats deff NOT a floating ground but a power/circuit ground :) Though I think a floating ground would just do nothing....

Dr. Kilovolt - Shall do! I will tell results... What if I get no readings??? WOuld that mean its a faulty capacitor or proves its a bad flyback (Secondary winding)

Antonio

Wed Apr 22 2009, 02:00AM

Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644

A high-voltage supply of this type not grounded tends to put negative hv at the circuit ground. The result is an enclosure box that sparks to you, before the insulation of the power transformer is broken. You can destroy the controller by touching a potentiometer or a switch connected to it.

twist2b

Wed Apr 22 2009, 04:50AM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

One person who took the shematic I see and simplified it.. its not as effective... alot of the components overheat, and blow over time (the diodes usually) BUT I don't remember him saying anything about grounding his flyback... are older flybacks different? (His looked older)

I have not had the chance to test the flyback yet, More news on the goodlyness of my flyback tomorrow.

101111

Wed Apr 22 2009, 06:24AM

Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263

Check if everything is okay, your new driver should not be a problem.

Your LOPT seems to be a LOPT from a monitor, I would try to short the HV output with ground (GND on the LOPT) let the device run for about 10-15 seconds then try to draw arcs, this will let the internal capacitor charge.

If this is not the problems try to squeeze the red HV cable further in to the LOPT.

There could be an idea to test your driver on a light bulb before you try it on a LOPT.

Coherent

Wed Apr 22 2009, 03:06PM

Registered Member #1886 Joined: Sun Dec 28 2008, 02:55AM
Location:
Posts: 73

That's clearly a monitor flyback. The cylindrical part sticking out of the side is the capacitor. You might be able to mod it and make it work for arc drawing, but IMO it might be easier to just find an old tv and get the capacitor-free flyback from it. If at all possible try to find one of the old AC disk flybacks as they work the best for this kind of stuff.

Proud Mary

Wed Apr 22 2009, 04:35PM

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

Coherent wrote ...

That's clearly a monitor flyback. The cylindrical part sticking out of the side is the capacitor.

I can't see any capacitor there myself, and the only 'cylindrical part' I can see is the secondary winding itself.

Coherent

Wed Apr 22 2009, 06:06PM

Registered Member #1886 Joined: Sun Dec 28 2008, 02:55AM
Location:
Posts: 73

Harry wrote ...

Coherent wrote ...

That's clearly a monitor flyback. The cylindrical part sticking out of the side is the capacitor.

I can't see any capacitor there myself, and the only 'cylindrical part' I can see is the secondary winding itself.

I circled the capacitor in red. I've actually cracked monitor flybacks open with a hammer before and I'm pretty sure that the circled part is a cap. Recently I tore a bunch of old monitors apart and the flybacks all had a cap like that on them.

twist2b

Wed Apr 22 2009, 10:37PM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

When I bought it on ebay, it was a replacement part for a TV... I know that for sure, though if its better to get an old flyback, that is good to know... I still have not found the other end of the primary, even feeding 30V -_-

twist2b

Wed Apr 22 2009, 11:11PM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

Ok, I think I did it.... o_O

SO I bought a replacement part for my 2.2uF capacitor... its finally come! ANd its working!!! I think...

I turned the thing on, and I started to hear sizzling.. I brought the H.V. main line close to (any) of the bottom probe thingys... and it sizzled LOUD!!!!! I only brought it close, not close enough to arc. I am very excited, but I want to make sure I am not going to hurt the flyback before I continue... I did not ground the flyback, and I am not going to be stupid... I am going to wait until someone gives advice on why its sizzling when its not close... (BARLEY sizzles)

BTW - The test I did was with the COMPLETE circuit :)

Its soooo cool! I am so excited :)

So the only prob with my circuit was the capacitor o_O

Arcstarter

Wed Apr 22 2009, 11:37PM

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

It is sizzling because it is high voltage XD.

Flybacks sizzle, that is from the high voltage, it is fine. I have NEVER grounded my flybacks, perhaps i should start doing it.

Just find which pin is ground by bringing the HV near the pins, and when you find which one it is solder a wire to it! Drawing arcs usually will result in a pin burning down, or just melting the 'stuff' and that helps cause carbon tracks.

previous 1 2 3 4 next

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob