Hi Jonathan, Okay I'll check out that page and see if I can understand why changing those values would be better. As per gregeberts recommendation above I have already reworked my design and put in the HV5530. I have 12V coming in from a wallwart to the power supplies and right now I just have this powering the HV5530. With some additional regulation and filtering would this be okay or is it necessary to level shift it from the 5V?
Shep On Thursday, March 31, 2016 at 12:26:12 AM UTC-6, Jonathan F. wrote: > > Hello Shep > > > Some words about the power supply. > I would change the inductor to a higher value, about 100uH. And RSENSE to > 0.05R, which could deliver about 50mA. > C4 is fine, but 4,7u would be enough. > > Here is a very fine and detailed power supply using the MAX1771 > http://desmith.net/NMdS/Electronics/NixiePSU.html > > > For direct driving, you could use the HV5122 or a similar device. But you > would need a 5V to 12V level shifter. If you need more info, i can provide. > > > Am Mittwoch, 30. März 2016 23:41:58 UTC+2 schrieb Asstroman: >> >> Hello Jonathan, >> >> I may eventually end up using a fixed voltage regulator but the reason I >> have an LM317 in this schematic is that I already have these and necessary >> resistors so it was mainly just to keep cost down. And that's an excellent >> point about multiplexing that I hadn't really though of so I thank you for >> that. After this and the previous comments I think I may just use direct >> drive. I'm not sure why but I was originally thinking that multiplexing >> would be more feasible because I wasn't sure if I could get enough power >> out the power supply. But after I took another look at it I think the power >> supply will have no problem driving the necessary ~38mA. I'm still weighing >> the pros and cons as I figure them out. >> >> Shep >> >> On Tuesday, March 29, 2016 at 1:04:19 PM UTC-6, Asstroman wrote: >>> >>> Hello, this is my first post here in the NeoNixie group so I hope this >>> is an acceptable thread topic. I'm excited to find other people interested >>> in this sort of thing to get some feedback if anyone has it to offer. >>> Attached is a preliminary schematic that I designed for my first go at a >>> Nixie clock. (When I say I designed I mean pieced together from the >>> internet and filled in some gaps). I'd greatly appreciate any feedback >>> anyone has on it concerning better methods or any major problems that would >>> prevent if from working. Eventually I'd like to add in more features like >>> acquiring the time via WiFi or GPS, temperature sensing and better dimming >>> control and such, but for now I'm keeping it relatively bare bones (I >>> think). I'm using an Atmega328p as the uC which will be communicating via >>> I2C with a MAX1771ESA+ RTC chip. Even though I know multiplexing shortens >>> the lifespan of the tubes I've decided to go with using MUXing because I'm >>> not so knowledgeable on SMPSupplies (yet) and don't quite know how to get >>> the necessary current out of one to use Direct Drive. My scheme is to use a >>> 3:8 encoder on the anode side to select which anode is on. And on the >>> cathode side I'm using a bin-decimal converter to select which digit is >>> displayed. Each digit of a tube is attached to the same digit on the other >>> tubes so that when the bin-decimal converter turns on the base, say for the >>> "1"s transistor, all the "1"s for each tube will turn on on the cathode >>> side, but only the correct anode will be on, thus displaying only the >>> correct number on the intended tube. I haven't seen another design that >>> does exactly this in the same way so I am not 100% confident it will work. >>> It seems pretty straight forward, but then again, as with all electronics >>> projects it probably isn't. I will include in my code some measures to >>> avoid cathode poisoning, however, I just learned of another issue which is >>> blue spots appearing somewhere on the anode mesh... I think. I still need >>> to do some research about this and how to avoid it but if anyone has any >>> knowledge about this they'd like to share I would appreciate it as I'd like >>> to avoid this from happening in my design. Thanks for your time and I look >>> forward to any and all responses. >>> >>> >>> Shep >>> >>> >>> >>> <https://lh3.googleusercontent.com/-RRq4J135lbY/VvrQxlYW6XI/AAAAAAAAAIc/2oLMtnUf_D8VJ-XBmZ1EXu7h3Dj5EsVsQ/s1600/PG1.png> >>> >>> >>> >>> >>> <https://lh3.googleusercontent.com/-X4PchxD2EL0/VvrQiT0novI/AAAAAAAAAIU/cnEds-f5Ogw4bWnU0JzZSScAFpwxayLbw/s1600/PG2.png> >>> >>> >>> >> -- 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 an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/3d913e96-a1d2-49d4-aaec-94cc8f54b6d6%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
