Categories

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.

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments

  • Sjaak: They are available with more flash then their ST counterparts which makes them more interesting. You don't have to port the code, but use another...
  • Sjaak: I dunno if you can 'license' register definitions, but I'm not a lawyer. Since the chip is available since 2015 and I haven't heard of...
  • Sjaak: They can be found on taobao or the Chinese markets in Shenzhen.
  • KH: I've been a really good boy, I only buy MCU parts from RS and Farnell. :-)
  • Bandi: Not sure if you're trolling or just spent the last few years under a rock... GD32 chips have been around since at least 2015. AVR...