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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
... yeah, very easily.
A normal modern flyback puts out half wave rectified DC, which is perfectly fine for a marx. However, for a CW multiplier you need AC, and need to find an old flyback from the 1950's and earlier...
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Inducktion wrote ...
... yeah, very easily.
A normal modern flyback puts out half wave rectified DC, which is perfectly fine for a marx. However, for a CW multiplier you need AC, and need to find an old flyback from the 1950's and earlier...
Or wind your own like I have just done, this thing puts out some very hot arcs!
Believe it or not, I'm also trying to build a flyback transformer! I'm planning on building the first design on this page (http://sites.google.com/site/uzzors2k/flybacktransformer), as it seems good enough for charging capacitors stably (please tell me if this is incorrect!), running at 9/12 v.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Steve Conner pointed out an elegant regenerative snubber by Jan Martis (there's some scientific papers on it as well, but I don't recall the name). It will slightly reduce the peak voltage, but he seems to still get good sparks.
Don't know how conservative the voltage rating on the snubber capacitor is, might want to run some calculations or measurements to make sure it won't blow up. Also I'm not entirely certain the circuit behaves well at on-times of less than sqrt(L*C).
Another option is two switch flybacks, but that will greatly reduce the peak voltage capacity ... still appropriate for capacitor charging, but not so much for striking sparks with low primary voltages.
Registered Member #4034
Joined: Thu Jul 28 2011, 10:41PM
Location: somewhere in the Southern hemisphere
Posts: 138
@Jhackulon Me and a friend just whipped up that cuircuit a few days ago (we were bored and wanted a taser) well turns out that it's not to fun touching the outputs, and INSULATE your mosfet on a LARGE heatsink. It gets hot quick!
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
If the transistor is getting too hot, it's because its avalanche diode is conducting because the pulse over the transistor when it switches off is too high. This is caused by too few turns on the primary winding or too small snubber capacitor or too high power supply voltage. Naturally, you don't want to touch the output of a taser...
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Flyback Driver questions
