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7400 competition entry: Constant load with nixie readouts

Posted on Tuesday, November 6th, 2012 in 7400 contest, contest by DP

Want to test your power supplies? How about using a constant load with a Nixie display, built entirely out of 4000 series CMOS logic chips.

This is a Constant Load generator that is controlled by a keypad. When I started this project I was not sure what it would end up being so I built in in modules that are interconnected. This gives me greater flexibility and it is easier for a beginner to understand the schematics and operation of the parts.

I use only CMOS 4xxx -logic running on 12 volts with the exception of the Russian K155N1 Nixie drivers – they are TTL and uses 5 volts.

Check out the video after the break.

This entry was posted on Tuesday, November 6th, 2012 at 1:00 am and is filed under 7400 contest, contest. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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  • KH: Whoa, some of the code this engineer writes... Just look at part one of the above blog post, see how he coded the 7-segment encodings...
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