7400 competition entry: Beeping down counter

Posted on Friday, October 21st, 2011 in 7400 contest by DP

Chris decided to enter another project into the Open 7400 Logic Competition. The beeping down counter, as it’s name suggests, is a pre-settable timer which beeps and uses a display to show the seconds left on the timer.

The goal of this project is to duplicate the down counting circuit used by the character Ivan Vanko in Iron Man 2 to aid his escape from prison in Manaco. There are three key components that go into this design:


  • A Down Counter With Dual 7 Segment LEDs
  • A Push Button To Initiate The Down Counting
  • A Quick ‘Beep’ Sound With Each Down Count

Via the contact form.

He also filmed a video of his project which is shown below.

This entry was posted on Friday, October 21st, 2011 at 11:00 am and is filed under 7400 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.

One Response to “7400 competition entry: Beeping down counter”

  1. kenneth says:

    its not working in my app. in livewire and multisim so i cannot convert it into the pcv..i thought it will work so i buy the components but when i try to simulate it does not working…i tried it many times but still it does not working…can you send me a better schematic diagram so i can convert it to a pcv layout and i can use it in my project?..ty..

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