Display is dark only LSB

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chibanbon
 
Posts: 2
Joined: Thu Jun 14, 2012 12:52 am

Display is dark only LSB

Post by chibanbon »

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.
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kit1
kit1
12-06-13 12 09 31.jpg (661.17 KiB) Viewed 1306 times
kit2
kit2
12-06-13 12 09 22.jpg (779.74 KiB) Viewed 1306 times

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adafruit_support_bill
 
Posts: 88087
Joined: Sat Feb 07, 2009 10:11 am

Re: Display is dark only LSB

Post by adafruit_support_bill »

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.ph ... 6&p=130839

chibanbon
 
Posts: 2
Joined: Thu Jun 14, 2012 12:52 am

Re: Display is dark only LSB

Post by chibanbon »

I try this.
thank you.

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