Dangerous Prototypes

Here’s a bug shaped robot entered into the open 7400 competition. Power by a solar panel, this 7400 logic based robot moves toward the life giving light source.

Powered by a solar panel, this miniature robot shuffles towards the light.  This project was a venture into BEAM robotics, a now seemingly defunct genre characterized by simple circuits with complex behavior. This autonomous, bug-shaped beast soaks up sunshine on its solar panel and converts it to bursts of movement on its tiny motors.

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the forum.

Need a quiz show buzzer system? Check this out!

A Quiz Show Buzzer was just built only with 74XX series device. A single 74LS373 Octal D-Type Flip Flop was used instead of several AND gates. Eight DATA INPUTs serve as quizzer’s user interface and the eight DATA OUTPUTs were connected to 8-input AND gate which provide the logic HIGH or LOW to GATE INPUT of 74LS373, the purpose of this is to disable all inputs after the first output became logic HIGH. The logic signal from DATA OUTPUTs can be use to drive a 7-segment display (for displaying quizzer’s number) and SSR (for indicator).

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the contact form.

Do you like to play games? Try this Jayahari’s fun Tic Tac Toe game:

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 ! :)

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the contact form.

Here’s another Open 7400 competition entry a 4-bit homebrew CPU designed by Jaromir:

Since I was born in mid eighties, I’ve never experienced real 74xx build. Few gates here and there was common, but lager designs were practicaly uneeded – as microcontrollers, CPLDs or FPGAs replaced need for such as work.
But my posession in vintage systems and desire to understand inner working principles of modern devices brought me to design of simple CPU made of simple 74xx devices.

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the contact form.

Check out Giuseppe’s Open 7400 competition entry. It’s a 1 bit microprocessor based on the MC14500 CMOS chip.

This circuit is based on the CMOS chip MC14500. This chip is an ICU (industrial control unit) built from Motorola few years ago, it is a 1 bit processor that can do some logical operations. This chip is now discontinued but can be found on ebay and other sites.
My circuit probably doesn’t have an application in real world, but can be useful for didactic purposes, to learn how a simple microprocessor works.

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the forum.

7400 Logic Based Calculator is the open 7400 competition entry by students of the Pakistani Institute of Industrial Electronics Engineering. This was an assignment during their 6th semester course Digital Electronics II.

Digital logic based calculator built on 7400 series ICs which can add and subtract two digits with clear, and backspace as well

This project is made to perform calculations on 5-Bit signed data. Meanwhile we also need to implement logic to detect the type of input user pressed, and to perform operation as required. After all these things have been implemented we just need to display our data using 7-segment decoder to 7-segment display.

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the contact form.