A scope gives a better picture of what is happening. Before you go to a constant high voltage supply you should check the display specs.
And, a constant voltage will cause more power dissipation in any series resistor. Better check the rating. This is where others here are of more use to you – I just wanted to be sure that you had spotted the pulsed aspect of the DC in that circuit, I haven’t played with this device. If you were going to sub another supply and just went by meter readings you might have been led astray. John k [This is so like that Watts RMS thing I tried to get nibbles on. Btw, I did send you something the next day Charles.] From: [email protected] [mailto:[email protected]] On Behalf Of Richard Scales Sent: Sunday, 14 April 2019 16:04 To: [email protected] Subject: Re: [neonixie-l] Re: ZM1050 / Z550M 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, <[email protected]> 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: [email protected] [mailto:[email protected]] 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 [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/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> . 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