First of all thanks to DangerousPrototypes! its because of you guys I worked on logic gates after college – else its usually the usual microelectronic stuff! 🙂
This build is a simple ‘Tic Tac Toe’ game. I ended up using 30 Logic ICs ! 🙂
Lets see the video first, then lets see the design
Video:
Design document:
<PDF alert> This document: Tic_Tac_Toe has all the block diagrams and circuit diagram used.
Pictures:

Tic Tac Toe
Do leave a comment if you have any queries!
PS: The casing is ugly 😛 Trying to build a good case for this project!
<Edit> Won a first place in the 7400 contest !
Tags: Circuit, Logic7400 Contest
[…] another entry in the 7400 Logic contest. [Circuitchef] used gates and a few flip-flops to build a two-player electronic Tic-Tac-Toe game. The full details or shared in the PDF file he links to in his post. We’ve also linked to it […]
[…] another entry in the 7400 Logic contest. [Circuitchef] used gates and a few flip-flops to build a two-player electronic Tic-Tac-Toe game. The full details or shared in the PDF file he links to in his post. We’ve also linked to it […]
I think you guys form INDIA…
Me too…
Me too did similar one in my college days Carry on GUYS..
[…] Circuitchef's Blog Build Log « Tic_Tac_toe […]
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Tic_Tac_toe « Circuitchef’s Blog
Can I ask where the reset button is connected? Is it connected to the power? And how much power did you supply the circuit? 5V? 9V?
what are all the parts u used?? and how many
Hi
It is wonderful. I want to show the logic o my students of the course i offer “Digital Electronics and Microprocessors” so i request You to share the design document.
Once again I am happy that you have taken so much interest in digital electronics.
Best wishes
Prof. C R Sarma
I wonder if you know where I might obtain the boolean expression for this circuit? I am trying to explain boolean logic and have used this as a physical example of interpreting a boolean expression as physical gates but I don’t have the expression for your game. Any help appreciated but I understand if you do not have the time. Many thanks.
Wow this is really interesting project. Congrats!
The link to the schematic is expired but you can find a copy here: https://hackaday.com/2012/11/05/two-player-tic-tac-toe-from-logic-chips/