Hi David, I do indeed have a scope and am starting to get the kind of results i wanted now I have changed out the PSU for a more capable one.
So far, from my testing: HV 200V. Anode resistor of 3k9. Voltage across anode resistor during pulse is between 42 and 48v (depending on the individual tube - some are a little different) This equates to a pulse current of about 12.3mA, which is within spec for an IN14, which specifies a maximum pulse current of 13mA. (and no idea about an IN12, as I can't find any reference to multiplex current mode in any of its' data sheets, but as it's a similar size, I'm assuming similar values will be OK. With two 'test' tubes I didn't seem to have any issues with ghosting as long as a sensible blanking interval is applied, but once I've put the whole assembly together, I will see what happens this time! Thanks for the advice! David On Fri, 1 Feb 2019 at 05:05, David Forbes <[email protected]> wrote: > Hi, I have some experience building multiplexed Nixie clocks that work > correctly. Firstly, do you have an oscilloscope? It's difficult to > understand what is going on without one. > > I found that 190V was sufficient to run ZM1040 tubes with a 10k anode > resistor shared by all tubes. I would have to measure it again to know the > current and anode voltage, because it's been about fifteen years since I > last made one. > > Ghosting is a problem unless you time the anode and cathode switching > properly. I turned off the anode, waited a few milliseconds for the tube to > turn off, changed the cathode selection, waited a few milliseconds, then > turned on the next anode. I also used PC board cathode wiring instead of > discrete wires, to reduce capacitance. > > I remember that the anode current was 5 mA, and the anode voltage was > 140V, but I could be off. > > > > On Thu, Jan 31, 2019, 4:46 PM David Pye <[email protected] wrote: > >> Still testing,and indeed, finding gremlins :-/ >> >> Even the copy of Elektronische Anzeigebauelemente Electronica 171 has a >> gremlin in it, being largely misprinted with huge sections missing, >> including conveniently, the section on pulsed nixie operation. >> >> On a slightly different note, when anode-multiplexing, I can't see why >> one anode resistor doesn't suffice, as only one tube is ever on at once. >> >> I was pondering this kind of layout: >> >> >> HV supply->Anode resistor->Multiplex drive circuitry->TUBES >> >> Any reason why that would be ill-advised? >> >> David >> >> On Fri, 25 Jan 2019 at 20:53, gregebert <[email protected]> wrote: >> >>> Make sure you test the DCDC converter under full-load. Every one of >>> these I've ever designed & built always worked beautifully under low load, >>> and as the load increases all sorts of gremlins start creeping out of the >>> jungle. >>> >>> Some of them are easy to spot, like overheating. Others require you to >>> go poking around with a scope to find excess voltage or current. >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "neonixie-l" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> To view this discussion on the web, visit >>> https://groups.google.com/d/msgid/neonixie-l/11d50a9e-1533-450d-b34b-7d0c63aabe6b%40googlegroups.com >>> <https://groups.google.com/d/msgid/neonixie-l/11d50a9e-1533-450d-b34b-7d0c63aabe6b%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0ErixCXr_SD2-6DNX_1kiGx2Dwd7KbaAh6BdptNXiXDUQ%40mail.gmail.com >> <https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0ErixCXr_SD2-6DNX_1kiGx2Dwd7KbaAh6BdptNXiXDUQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CAPbqtvcqdakNW30G6DK%3DkTnM8EDPbUc2R%3Du77eUUbHr9zx9SnQ%40mail.gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CAPbqtvcqdakNW30G6DK%3DkTnM8EDPbUc2R%3Du77eUUbHr9zx9SnQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0Hi7tgaZLwKo8i%3D2K9GxGLmcmc-VUfyP8PxV3bch3-BEA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
