Nixie Clock RFT Z566M

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4 months 2 weeks ago #10814 by Marvin41
So the next project is coming up.
I bought 6 pieces of RFT Z566M to make a Nixi clock.



@ Ian can you tell me if the DDIN-18 is suitable for it?
other than changes to the footprint for the Z566M, would there be anything else to consider?
A question about the firmware of the DDIN-18 is there any progress with that?
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4 months 2 weeks ago - 4 months 2 weeks ago #10818 by Torsten Lang
Replied by Torsten Lang on topic Nixie Clock RFT Z566M
Hi Marvin,
let's see what additional information Ian has for you.

Two general considerations:
  1. Supply voltage
    You should follow the information in the datasheet. Typically any "smaller" Nixie tubes operate at 170V so that they reliably light up. The actual sustain voltage will most likely around 130V..135V, the ignition voltage will be around 140V..150V.
  2. Supply current
    Here, you should also take a look into the datasheet. Once you know about the voltages you will most likely need to adjust the resistance values to meet the requirements according to the datasheet.

BTW, for my ZM1350 I needed different resistor values because of the different segment sizes. For classic Nixies typically one value fits all segments...

For your Z566M you will find some basic data at Dieter Wächter's page under RFT Book 05 .

Regards,
Torsten
Last edit: 4 months 2 weeks ago by Torsten Lang.

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4 months 2 weeks ago #10820 by Ian
Replied by Ian on topic Nixie Clock RFT Z566M
Oh, I am slightly envious.

The HV generator is adjustable so the voltage should be fine. The rated cathode current is 4.5mA, which in direct drive will give 0.765W per digit. Over 6 digits that's a hefty 4.6W. We're near the limit of what a boost supply like that can handle, but to be honest it's not a lot more than the 4mA that an IN-18 wants. With an IRF640 (low Rds) and perhaps a heatsink it should work.

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4 months 2 weeks ago #10826 by Marvin41
Replied by Marvin41 on topic Nixie Clock RFT Z566M
Hello Torsten,

many thanks for your response.
I have already looked at the data sheet of Dieter Wächter and found that the line data of the Z566M are almost equal to those of the IN-18 tube.
The power supply is on the PCB adjustable with a 5 kOhm potentiometer therefore no problem.

Regards
Hartmut

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4 months 2 weeks ago - 4 months 2 weeks ago #10827 by Marvin41
Replied by Marvin41 on topic Nixie Clock RFT Z566M
Hi Ian,

it was a little luck to find these tubes.
The Z566M tubes come from a Digital Multimeter V543 built in 1979 and were made in Poland by Meratronik.
I will make a board and then test if the IRF640 needs a heat sink or not.
Although hard at the border but I think that we will not come over 65 ° C.
I will contact you as soon as I can show a result.

PS. did you start with the firmware update for the DDIN-18?

Regards
Hartmut
Last edit: 4 months 2 weeks ago by Marvin41.

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4 months 2 weeks ago #10830 by Ian
Replied by Ian on topic Nixie Clock RFT Z566M
I have a test clock with me: I will work on the firmware at the weekend! I have a lot of train time over the weekend.

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