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

  • Bob: Free PCB for me!
  • Drone: Nice - but I'm most interested in the enclosure with the finger-leaf cover. Where did that come from? How to buy more?
  • Dave B: Got two of them. If you let the battery run flat, they don't charge! You have to pull the battery, and get enough charge in...
  • Bill F: My turn?
  • Chris: Ok!