Thank you for that, I think I'm getting there, I can see that the peak volts will be higher, 1.414 x 110 v. On that basis should I be OK using a DC supply of equivalent voltage or perhaps even higher by changing the series resistor value (I have several 170V supplies) then switching S0 to S9 via 5v TTL? Richard
On Sun, 14 Apr 2019, 06:22 johnk, <yend...@internode.on.net> wrote: > A bunch of my email delivery posts are out of order and missing some [for > lots of groups]. > > I’ll comment anyway. > > Notice that there is no smoothing capacitor in that diagram [if we are > looking at the same one]. > > This means that with the halfwave rectifier you are going to get pulsed > DC rising to the peak of the sinewave 110V. That peak is 1.414 x RMS. > > So, with luck you get 155V that is rising and falling and then a gap and > then repeat. Assuming the 110 actually IS 110. > > > > Different meters will give different answers because of the pulsing aspect > of the DC. Moving coil meter will show average [0.318 x pk for this > example]. DMMs depend – look at the manufacturer specs. > > > > Hope I am not repeating other posts, > > John K > > > > > > *From:* neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] *On > Behalf Of *Richard Scales > *Sent:* Sunday, 14 April 2019 14:40 > *To:* neonixie-l > *Subject:* [neonixie-l] Re: ZM1050 / Z550M > > > > The main reason for not using that circuit is that I don't have that > transformer to hand though I do have many DC power supplies available and > I just wanted to get the voltage right. > > > > Having looked in to it in more detail is seems that it's just a half wave > rectifier which should yield 0.45 x 110 V = 49.5V - so could I just use a > 50V dc supply instead? > > > > I would use a micro to generate the control signals - perhaps with a 74595 > shift register to reduce the pin count - does that all sound like a plan? > > > > Richard > > > > > > On Saturday, 13 April 2019 05:15:42 UTC+1, Richard Scales wrote: > > I just discovered one of these tubes (labelled as a Dario ZM1050 / Z550M) > in what looks like NOS condition. > > I heave read a lot about from from various sources such as: > https://www.dos4ever.com/Z550M/Z550M.html and here > http://www.tubebbs.com/tubedata/sheets/013/z/ZM1050.pdf and I note that > several articles refer to driving them in normal 'Nixie' mode rather than > using the 5V switching that they were designed to support. > > > > Before I hook this up to the grid I wonder if anyone here can confirm > voltages and anode resistor values that might stop me from frying the thing > as I also read that they might be few and far between. > > > > From various specs I have found they seem to suggest a supply voltage of > 90V ac and a cathode current of around 3mA. I am insufficiently qualified > to translate that to the 170v DC supply, strike and maintaining voltages > (and hence series resistor values) that I am more comfortable with. > > > > The pinout shows a cathode, an anode and st0 - st9 and from what I can > understand from the notes is seems that the original design concept was to > drive st0 - st9 with 5V levels as high voltage transistors were not readily > available at the time. > > > > Has anyone driven these in any way and if so, would they be able to > provide some further insight? > > > > -- > 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 neonixie-l+unsubscr...@googlegroups.com. > To post to this group, send email to neonixie-l@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/34de48a4-1c54-432f-9567-2b54d32988f5%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/34de48a4-1c54-432f-9567-2b54d32988f5%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 a topic in the > Google Groups "neonixie-l" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/neonixie-l/838C4tOY8jQ/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > neonixie-l+unsubscr...@googlegroups.com. > To post to this group, send email to neonixie-l@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/004b01d4f282%24135736a0%243a05a3e0%24%40internode.on.net > <https://groups.google.com/d/msgid/neonixie-l/004b01d4f282%24135736a0%243a05a3e0%24%40internode.on.net?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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CA%2B9r3s8OpUydo%3Dzm6w21jHx5yJtFTsOH%3DB95%3DAxgLE3Eomp9kA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
