Controlling with ground (cathodes) is correct. However, controlling with positive (anode) is not correct. Controlling with the positive is more challenging. Attached are two options—using a phototransistor (on the left) and using two transistors (PNP and NPN). Of course, there are more options... Of course, instead of connecting the anode control to a microcontroller, you can use a 4017. R2 and R5 are current-limiting resistors.
poniedziałek, 26 sierpnia 2024 o 23:26:33 UTC+2 Senk Ju napisał(a): > I unfortunately don't have any resources but what I would recommend doing > is the following: > > Use a decadic counter IC (like the CD4017) for controlling the active > tube. If your clock has four digits, connect the fifth output of the chip > to its reset pin. Also connect the reset pin to your microcontroller so you > can reset it after the clock has been enabled. Pulse the clock pin of the > chip to switch to the next tube. > > Use a BCD to decimal decoder (like the CD4028B) for the cathodes. This > way, you will only need four IO pins of the microcontroller to display set > the current digit. > > Connect the output pins of the decadic counter and BCD decoder to high > voltage transistors like MPSA 42 to control the high voltage. Then connect > the same cathode of every tube in series through the corresponding > transistor connected to the BCD decoder. This way you can control which > anode gets HV and which cathode is grounded. > > > I have attached a simplified schematic of how I would do it. Hope that > helps. > > > Xavier Burton <[email protected]> schrieb am Mo., 26. Aug. 2024, 22:38: > >> I have been working on a modular nixie tube display for the last few >> months as a learning exercise, and I would like to learn muiltiplexing next >> in order to reduce the number of pins used for controlling them. What are >> some good resources I can look at? >> The pictured unit with the energized tubes is my original prototype, >> hence the garbage wiring and excess number of test points. The other >> pictures are the current pre multiplexing version. >> >> -- >> 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 view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/CAOt79-vM7Zudj-ts%2B%3DtH4mAogqU01VuMsrB3uH0UugRNzJbHzQ%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/neonixie-l/CAOt79-vM7Zudj-ts%2B%3DtH4mAogqU01VuMsrB3uH0UugRNzJbHzQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/510c3659-9023-467c-a436-042431aaa554n%40googlegroups.com.
