> Thanks for all the input so far. I am gravitating towards a switching > HV supplier (like the 555 style) plus a multisegment CW multiplier.
Makes sense. The CFL inverters mentioned work similarly to the HV power supply in the CyClock, driving a step-up transformer with a couple of transistors. Either approach would be suitable. > But how would it look from a practical point of view for this particular > application? For high voltage stuff like this, I use big open layouts. I like to put the diodes in a line, and arrange the capacitors around them, but it's not critical. Keep it separated from your low-level circuitry. If you like, I can take some pictures of commercially made multipliers, but they mostly illustrate that pretty much any sane arrangement of components can work. > What kind of capacitors would work the best? Ordinary ceramic disc capacitors work fine. Given the tiny current draw of a Nimo, ripple is unlikely to be much of a problem. A little ripple won't bother a Nimo anyway. > What switching frequency would be practically best suited? You want the frequency to be high enough that reasonable sized capacitors and magnetics will work, but not so high that you're losing too much energy in diode switching losses. I'd say something in the 40 to 60 kHz range should work fine, and it's out of the audible range, which can be nice. Any ripple-induced flicker would be invisible at that frequency, so you don't have to worry about ripple, unless you're multiplexing, in which case you may need to adjust one of the frequencies if they happen to to be close to harmonically related. > Thanks, > Marcin > > On 8 Nov, 01:48, Jeff Thomas <[email protected]> wrote: >> Marcin, >> Back in 2003; I used a low cost CFL Inverter, and added a multiplier >> on the backside to power a one tube NIMO clock called the CyClock. >> Here is a link to the schematic in PDF >> form:http://www.amug.org/~jthomas/cyclock.pdf >> >> The MCU was James Sweet's AT2313 one tube Nixie clock, controlling the >> grids via simple analog switches. >> >> Regards, Jeff >> >> On Nov 6, 2:55 am, marcin <[email protected]> wrote: >> >> >> >> >> >> >> >>> Hi All, >> >>> Recently I acquired couple of those Nimo tubes. And now of course I >>> would like to test them. >>> Nimo needs 2.5kV DC @ 35 uA of anode voltage. >>> How to generate this kind of voltage? The current is almost nothing. >>> Would it be possible to use 10+ stages of voltage multiplier starting >>> from a regular switching Nixie power supplier? Or rather should I look >>> into designing something myself? Probably as a fly-back transformer? >>> I would be grateful for any suggestions, solutions. >> >>> Cheers, >>> Marcin > > -- > 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. > -- 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.
