Display is dark only LSB

Tick Tock Clock Kits

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Display is dark only LSB

Postby chibanbon » Thu Jun 14, 2012 12:01 am

Hello!

I bought Ice tube clock kit in your pages 1 week ago and I made it.
But I found out display problem.
It is the problem that LSB is dark like this picture.
This picture is my kits. They have same situation.
So, I checked my kits. But, drive voltage and soldering is correct.
I don't know why LSB is dark.
Attachments
12-06-13 12 09 31.jpg
kit1
12-06-13 12 09 31.jpg (661.17 KiB) Viewed 848 times
12-06-13 12 09 22.jpg
kit2
12-06-13 12 09 22.jpg (779.74 KiB) Viewed 848 times
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Re: Display is dark only LSB

Postby adafruit_support_bill » Thu Jun 14, 2012 5:03 am

This is mentioned in the FAQ. It is due to the way the tube is driven. The DC bias voltage decreases along the length of the tube so the digits at the end are dimmer.

One customer has come up with a nice software hack to address the problem: http://forums.adafruit.com/viewtopic.php?f=41&t=23586&p=130839
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Re: Display is dark only LSB

Postby chibanbon » Fri Jun 15, 2012 2:49 am

I try this.
thank you.
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