Flyback Drivers 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! 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. 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. 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. Home
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