The wires to the nixies are 10 to 20 cm long. The output of pin 3 on the 555 looks like this in the highest voltage where the problem exists.
<https://lh5.googleusercontent.com/-U2MTDu_zPGE/UZFc8Iif_1I/AAAAAAAABI4/4hwtpldobew/s1600/2.jpg> <https://lh5.googleusercontent.com/--3BV9BSqQo4/UZFc4DKTUiI/AAAAAAAABIw/Vxo5mGBwA1I/s1600/1.jpg> Am Montag, 13. Mai 2013 23:11:44 UTC+2 schrieb dr pepper: > > What spence says, and keep your wiring short esp to the nixies. > A 1000u cap right at the power input wouldnt be bad either. > If the issue occurs at a certain ht voltage then maybe your reaching > the breakdown voltage of the switching fet/transistor, I've had this > before. > Another thing is the inverter high voltage supply inductor could be > saturating, this will happen suddenly and when it does it'll pull lots > more current and possibly deck the supply to your logic causing the > rtcic to freak out, if the inductor is warm then thats a sign this is > happening. > > On 13 May, 15:17, Spencer W <upnxwoo...@yahoo.com> wrote: > > You want a small capacitor, usually 0.1uF on each power supply of the ic > as close as possible to the pins. > > > > So on the ds1307, you want it on pin 8 as close as possible. > > > > This image shows what I mean, > > > > This goes a little deeper into why its needed, > http://hackaday.com/2008/09/29/parts-01uf-decoupling-capacitors/ > > > > Sent from my iPhone > > > > On May 13, 2013, at 6:49 AM, nix <daniels.ser...@gmail.com> wrote: > > > > > > > > > not sure. There is a capacitor on the highvoltage power supply. is > this a decoupling capacitor? > > > > > Am Montag, 13. Mai 2013 13:45:46 UTC+2 schrieb Spencer: > > > > >> Do you have decoupling capacitors on all ic's? > > > > >> Sent from my iPhone > > > > >> On May 13, 2013, at 6:19 AM, nix <daniels...@gmail.com> wrote: > > > > >>> Hello I just build my own Nixie clock with input from Arduinix.com > and a power supply from ledsale (Build a nixie power supply - LEDsales) > > > > >>> Attached find the circuit and the pcb from fritzing. The clock works > fine but when I adjust the high voltage with R36 the ds1307 module from > Twig > > >>>http://shop.boxtec.ch/twig-ds1307-p-40355.htmlstarts to flicker > because on the serial interface it shows strange numbers like 165:165:85. > After a while it does not return the time over the i2c interface at all. A > restart of the nixie clock starts showing the time again. With an > oscilloscope I can see that after a certain position on R36 the SDA puls > disapear and it shows a flat line. I think it is at high level. Not so > shure how to read the oscilloscope. > > > > >>> Any Idea why? I don't see a direct link from the high voltage power > supply to the 2 wire interface. (see attached circuit) > > > > >>> Kind regards > > > > >>> Sergio > > > > >>> -- > > >>> 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 neonixie-l+...@googlegroups.com. > > >>> To post to this group, send an email to neoni...@googlegroups.com. > > >>> To view this discussion on the web, visithttps:// > groups.google.com/d/msg/neonixie-l/-/jgtKRhvfY7IJ. > > >>> For more options, visithttps://groups.google.com/groups/opt_out. > > > -- > > > 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 neonixie-l+...@googlegroups.com <javascript:>. > > > To post to this group, send an email to > > > neoni...@googlegroups.com<javascript:>. > > > > To view this discussion on the web, visithttps:// > groups.google.com/d/msg/neonixie-l/-/TaAzQP23KfEJ. > > > For more options, visithttps://groups.google.com/groups/opt_out.-Hide > > > quoted text - > > > > - Show quoted text - > -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/LJTGfXIjs-AJ. For more options, visit https://groups.google.com/groups/opt_out.
