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Registered Member #1886
Joined: Sun Dec 28 2008, 02:55AM
Location:
Posts: 73
I just obtained a ton of nice looking flybacks. I've tested them all with a 18W CFL driver and they all seem to be working. I didn't get very big arcs with the 18W driver though. Now if only the 2n3055's I ordered would arrive I could make a proper driver. The 2 large vintage disc flybacks have external rectifiers that I can easily attach or take off depending on whether I want AC or DC output. I also found a medium sized vintage flyback, 3 small disc flybacks and various modern flybacks. One of them is huge/ Pics.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Yea, the 2n3055 driver sucks. Very low power, and a ton of heat. The 2n3055 will have to be on a heatsink. If you need one, i have one i could sell to ya. It is large, so can dissipate a lot of heat. which the transistor will make.
I also have some nice 5 watt resistors with a value good for the driver, and i have one 2n3055. I also have some nice enameled wire. This is good because some flybacks do not have a large enough winding window for thick insulation. This stuff is around 18 gauge, double build wire thickness. I also have some transistors that would work better than the 2n3055 with no modifications to the circuit. They are 9 amp, 100-200 volts. I have quite a few (about 12). Also, these have very high gain, so they will turn on faster/more complete, and they will surely heat much less than the 2n3055. I have tried them before, and they had better sparks, and a ton less heating. The heatsink can fit both 2n3055, and to-220 packages(which are what these transistors are).
Do not expect much more than 18 watts from the driver. A ZVS is very very simple, and can pump insane amounts through a flyback with high enough voltage. At about 40 volts input, i kill flybacks very quick. I killed one in 2 seconds. With 12-24 volts, the flybacks should have nice lives.
Registered Member #1886
Joined: Sun Dec 28 2008, 02:55AM
Location:
Posts: 73
I'll probably make a zvs driver after messing around with the 2n3055's a bit. For now I just want to start with something simple. Couldn't I parallel a bunch of 2n3055's for increased power? I could mount them on a large finned heatsink with a CPU fan for cooling.
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Just got a ton of nice old flybacks =)
