PCB assembly discussion


Instructions and discussion for constructors of our nixie button kit

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Post Sun Apr 19, 2015 7:28 pm

PCB assembly discussion

Suggestions for improvements, mistakes, hints here please.

Site Admin

Posts: 935

Joined: Tue Jul 24, 2012 8:05 pm

Post Tue Feb 07, 2017 7:10 pm

Re: PCB assembly discussion

The .hex file for a PIC10f320 if you need to program a replacement:
Attachments
Button piccode.rar
(258 Bytes) Downloaded 495 times

Posts: 6

Joined: Thu Aug 10, 2017 1:10 am

Post Sun Aug 27, 2017 5:09 am

Re: PCB assembly discussion

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?

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Post Wed Aug 30, 2017 3:14 am

Re: PCB assembly discussion

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.

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Joined: Thu Aug 10, 2017 1:10 am

Post Wed Sep 06, 2017 6:49 pm

Re: PCB assembly discussion

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"?

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Post Fri Sep 08, 2017 5:36 pm

Re: PCB assembly discussion

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.

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Joined: Tue Nov 07, 2017 9:56 pm

Post Tue Nov 14, 2017 7:35 pm

Re: PCB assembly discussion

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.

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Post Wed Nov 15, 2017 4:17 am

Re: PCB assembly discussion

Those instructions have been up for over two and a half years and nobody else noticed... Fixed.

Thank you :)

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