Flyback shenanigans part 1: 555 timer





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Published on Jan 22, 2012

I built a flyback driver a while ago and I was waiting to get new stuff. Then my old stuff exploded so I was stuck with other old stuff.

Whats going on here is my best attempt at a flyback transformer with a 555 timer. I have it set up at 131.181 KHz with a 95% duty cycle to get most of the 40v input through my MOSFETs into my flyback's primary coil.

To get a good dual voltage transformer, take apart a UPS system (uninterruptible power supply) and you should get a good one. The older the better. (I have another one that can deliver 30A so I plan to use that for better flybacks)

With the set up I am using the flyback draws 4.5A while arcing. 2A idle. .

This "stuff" happened to be a; (parts list)

555 timer
resistors (10ohm x2 (or 5ohm), 100 ohm
Capacitors (.1uF, .39uF)
My mini flyback Transformer
A dual voltage transformer (has 15,15 and 30 volt wires)
My 5v step down power supply (NTE956 = LM317)
Two Toshiba K4373's (in parallel)

Sorry for the bad quality. I had to stay back because my Contour1080P HD gets affected from the EMF coming from the flyback. And for some reason the quality isn't very good.

If you ask nicely; information will be given.


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