With the decoupling capacitor on the ds1307, it is possible to go a little bit higher then the 170 Volts which is enough to illuminate all the digits. The error still occurs when going over the 180 Volts, but the clock seems to work :-)
<https://lh6.googleusercontent.com/-o8lFY1IVFKU/UZFjbZczxkI/AAAAAAAABJI/0_bldQJjLTI/s1600/1.jpg> Am Montag, 13. Mai 2013 23:37:14 UTC+2 schrieb nix: > > 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 [email protected]. >> > >>> To post to this group, send an email to [email protected]. >> > >>> 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 [email protected]. >> > > To post to this group, send an email to [email protected]. >> > > 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 [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/msg/neonixie-l/-/9hwqWPHv8XMJ. For more options, visit https://groups.google.com/groups/opt_out.
