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Flyback Drivers |
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A flyback transformer is a little guy that's found in TVs and monitors. He'll put out around 25kV if you're nice to him, which can be a lot of fun. They work so well for their size because they run at a pretty high freqency, around 20kHz, right about the audible range. Therefor, they need a DC input and a fast little transistor to work. I'm not going to draw up any circuits, becuase they are a pain, but I'll show you all my parts. Someday I'll be able do draw some fun little sparks, and maybe power a lifter or charge a marx generator and capacitor bank. They neat! |
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Above you'll see three different flybacks. The first one is a baby. The second one is an old cylindrical flyback with no internal rectification. It puts out AC and is neato. The third is a more modern flyback, most likely from a monitor. It has internal rectification, which is nice for pretty much anything but a tesla coil, since it puts out DC. It should also create the most voltage. |
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Above is the stuff that lets me have the high frequency DC input. The first two are bridge rectifiers, which are just a 4-pack of diodes that will take an AC sine wave and push out humpy (alternates b/w 0 and 160 at 120Hz, not -160 and 160 at 60Hz). Then I use 4 of those big blue capacitors to smooth out the current, so it really resempbles a straight line a lot better, maybe ranging from 145 to 160 volts. Finally, you can see two different types of transistors. They both work in the same way, but one is a lot bigger for some reason. THey are the guys that feed the flyback with 20 or so kHz. |
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Lastly, these are a bunch of 1kV, 1A diodes. I needed to get a bridge rectifier than could handle the old-style flyback and put out DC so I could run the lifter with it, but all HV diodes are really expensive, so I soldered up 140 of these bad boys to make my own 1A, 35kV bridger rectifier. The bag is a bag of 500 of these puppies I got for less than 10 buckeroos. |
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