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PCB assembly discussion

PostPosted: Sun Apr 19, 2015 7:28 pm
by Tony
Suggestions for improvements, mistakes, hints here please.

Re: PCB assembly discussion

PostPosted: Tue Feb 07, 2017 7:10 pm
by Tony
The .hex file for a PIC10f320 if you need to program a replacement:

Re: PCB assembly discussion

PostPosted: Sun Aug 27, 2017 5:09 am
by NixieFan1116
For the life of me, I can't get the switch to "click" or the output to read @ 5v when I touch the Nixie tube. Any suggestions on what to check?

Re: PCB assembly discussion

PostPosted: Wed Aug 30, 2017 3:14 am
by Tony
Sometimes they can be too sensitive and remain 'on' which won't trigger the relay. Check the voltage on the gate of T2 and if it's high, try adding a 5k6 resisor across R4. If that doesn't help reverse the primary connections on L1.

The relay requires 24V which is generated by L1's primary via D2/R1, this slowly charges C1. When it's triggered C1 is discharged through the relay coil causing a short 'on' pulse. if the relay is constantly switched on by T2 the capacitor won't charge and nothing happens.

Re: PCB assembly discussion

PostPosted: Wed Sep 06, 2017 6:49 pm
by NixieFan1116
Sorry for the ignorance, but what voltage should I be looking for? What should it be/ what would be considered too high? What contacts am I going to check when I "check it at the gate"?

Re: PCB assembly discussion

PostPosted: Fri Sep 08, 2017 5:36 pm
by Tony
It's the middle pin of T2, measure the voltage from there to ground. If it's not 0V it will be on and you'll need to add a 5k6 resistor across the 3k3 already fitted. Another thing to watch out for is if you're testing it before building it into the case and the nixie is lying on its side, contact with the table or work surface under the tube may cause it to be triggered.

Re: PCB assembly discussion

PostPosted: Tue Nov 14, 2017 7:35 pm
by Zedsquared
Just a quick instructions bug report:
You have the colour code description for the 12k resistor wrong on the third post down on this page: viewtopic.php?f=16&t=92
Also you don't actually say to fit the pic anywhere, as far as I can tell. It's sort of implied that it could be fitted before first power on because two pins get blobbed across "to protect the pic", but nothing definite to reassure the builder :)

Cheers,
Robin.

Re: PCB assembly discussion

PostPosted: Wed Nov 15, 2017 4:17 am
by Tony
Those instructions have been up for over two and a half years and nobody else noticed... Fixed.

Thank you :)