Adam, to add to my previous response, you are of course absolutely correct. I don't know what I was thinking when I gobbled together that schematic. Xavier, please ignore this part of my schematic. Sorry for the confusion.
Adam Piórko <[email protected]> schrieb am Mi., 28. Aug. 2024, 00:57: > 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 > <https://groups.google.com/d/msgid/neonixie-l/510c3659-9023-467c-a436-042431aaa554n%40googlegroups.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/CAPt9zv%3D5Cwg_g4Nk%3DkK8zcOBGU7ujpYogNN2-33_4LckwRtXng%40mail.gmail.com.
