wow, you know your stuff. I am using the MK II design. a 4403 and a 4401 driving the fet. i am using a sdr1806-101kl 100uh inductor with a 1.7a cont. and a 3.2a burst. I still have to do max current testing, but i think i will be surprised by the results. I made the power components traces really beefy so that i could potentially draw a large amount of current. Thanks for the info, i really appreciate it..
Jason On Apr 6, 2:07 am, threeneurons <[email protected]> wrote: > On Apr 4, 6:35 pm, jason greskoviak <[email protected]> wrote: > > | This is based off of a 34063a boost converter with feedback. > > Which configuration of the MC4063 ? This chip is used in three common > ways. for HV (over 40V) supplies: > > http://cid-f9db37b8211ce831.office.live.com/self.aspx/Snippets/MC3406... > > Hopefully, you're not using the MK.I incarnation. The MK1.5 & MK.II > versions add an active pull-down, which the MK.I does not have. Its > important for these fly-back circuits to turn the FET off quickly. > That means dumping the charge (Qi) from the FETs gate in short order. > With the MK.I, that's only a 330 ohm resistor. A passive pull-down > method. The active pull-down of both MK1.5 & MK.II versions dump that > gate charge thru a transistor, which is substantially faster than the > passive method. > > I've sold quite a few power supplies, on eBay, using a series of > supplies based on the MK1.5 version. Even with Taylor's offerings > right there next to them. A couple of fixed 180V versions, I sold > mostly on price. I got a bunch of parts cheap thru surplus channels. > In particular, a 220uh coil that All Electronics use to carry. I > bought over 500 of them, for ~ 20 cents each. They where real gems. I > could squeeze 45mA out of them (@180V, 12V in) with efficiency ~80%. > All Electronics sold out of those coils over a year ago, and the only > coils that spec similarly, cost considerably more. The power FETs I > also got on special. I'm very proud of that last supply, since it came > pretty close to Taylor's units (though still inferior), but using > basically junk parts. I sold hundreds of these. > > My last supply variant skirted direct competition, by being a dual > supply, It output both 180V and 540V, so you could run both nixies and > a dekatron at the same time. I just listed a new version, of the dual > supply that is adjustable, and uses a beefier coil. V1: 115V-225V, & > V2: 230V-450V. Plus I brought out the raw pulse, off of the coil, if > you want to multiply the voltage even more, or make a negative > voltage. The last dual supply sold quite well (used a different coil). -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
