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Registered Member #2321
Joined: Fri Aug 28 2009, 05:13PM
Location: Boston, MA
Posts: 34
Has anyone tried building a circuit for driving FBT within spec utilizing the original primaries? Sure output wouldn't be as beefy but stability must be useful for some projects?
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I'm sure it could be done with a 555 timer and an IRFP460. I say the IRFP460 since it's a 400V FET and the FBTs are usually run at 100 something volts on the boards.
It's much simpler to just wind your own primary if you can because that way the FBT will work better on a lower voltage. There are circuits out there that use the internal primary, but as you said, there isn't much power to be had.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
HVPaul wrote ...
Has anyone tried building a circuit for driving FBT within spec utilizing the original primaries? Sure output wouldn't be as beefy but stability must be useful for some projects?
That's the only approach I've ever used. When I take the trouble to construct something, I want it to last, and hopefully be better than something you could buy to do the same job, or there's no real point in making it. I don't have the resources in either time or money to commit to something that's poorly designed from the outset and doesn't work properly.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
I made several, always using the original primary coil. In some I used also the switching power supply taken from the same board, that already produces the right voltage. In one I took out of a monitor board the complete power supply and the flyback drive circuit.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I have done this with that single transistor driver... It was a long time back... I used another winding for feedback. I got muuuuch better performance than with an external primary. Not sure why, maybe better coupling a more efficient number of windings.
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FBT driver "native" circuit?
