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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
Sorry if it's a disappointment - but I've found most of those 'giant' DC flybacks to contain built-in capacitors, and just tend to produce high-current banging arcs which eventually damage or destroy them. If you were to draw arcs from them, you will need to put a high voltage and wattage resistor in series with output tolimit the current - which I never found to be practical.
The best DC flybacks are those that resemble just a cylinder around the core without much additional 'growths' on the side.
Regarding the arcing pins - try turning the focus pots if they are present, this helped one of my flybacks. Else, cut off the problematic pins and drill them down 2 to 3 mm, polish off all dirt and possible carbon residue and pour in some epoxy or polyester resin to seal. I wouldn't rely on hot glue for this.
Registered Member #3108
Joined: Thu Aug 12 2010, 05:37PM
Location: Worthing, England
Posts: 72
I have one of those giant flybacks with an internal capacitor. The banging sparks are cool, but now that Marko says it will eventually self-destruct. They would probably be more suitable for charging HV caps and used in marx generators?
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I took apart a third rear projection TV today. Gotta love craigslist. After playing with a giant frensel for the first time in a month (broke my last one after one day of fun), I took parts off the board. Here's what I found.
A superflyback with the same size coil as the others, but with seperate caps. Also like the others the focus control is separate. There isn't really any growths from this flyback, and I'm not even sure if the diode is built in. It may be built into the capacitor block.
Numbers on these ones! Flyback = KFT7AA334F1 Capacitors = KFT7CP336F Focus = TNXB003
I also got a bunch of power resistors and heatsinks out of it, as well as a can of the clearest mineral oil I've ever [not]seen.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
With some care you can open the case that contains the capacitor, the potentiometers, bleeder resistor, etc., and remove them. In at least some flybacks these components are not embedded in insulating material.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
These look completely potted in so I'm not going to even try to attempt that. The price was right (free) so I don't mind if I burn out the cap'd ones.
The parts for my ZVS should be here monday so it won't be too long until I fire up these bad boys. Any idea what I can do with the hyperclear mineral oil?
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Booze caps, oil soaked transformer, excuse me mineral oil is improper those kind of duties, they were the first to come to mind and I don't think I've ever used mineral oil, and definitely not for electronics stuff.
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Superflyback
