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Posts Tagged ‘7400 competition entry’

7400 competition entry: Flickering Jack-o’-lantern

Friday, October 21st, 2011

Jonathan entered a Flickering Jack-o’-lantern for the Open 7400 Logic Competition. He recorded a video of his project, which is available below. I used a 74HC14 to create four different square waves of different non-harmonic frequencies that were mixed together to flicker a red and blue LED. Via the contact...

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7400 competition entry: Logic PLL based switch-mode power supply

Friday, October 21st, 2011

Embeddederic entered a 7400 series logic PLL-based switch-mode power supply into the Open 7400 Logic Competition. Via the forum.

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7400 competition entry: 80M direct conversion receiver

Friday, October 21st, 2011

Jason added another entry to the Open 7400 Logic Competition: 80M direct conversion receiver I had fun using the 74HCU04 to make a little TRF AM radio, but my original goal was to build a direct conversion receiver. I didn't think I would have time before the deadline, but I managed...

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7400 competition entry: Game of Life with CMOS logic

Friday, October 21st, 2011

Andrey entered a Game of Life build from CMOS logic into the Open 7400 Logic Competition: This was supposed to be my entry for Open 7400 logic competition. It’s Conway Game of Life on 8×8 LED dot matrix, made with almost only 74HC and 4000/4500 series of CMOS logic chips....

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7400 competition entry: Homemade 7400

Friday, October 21st, 2011

Arup entered his Homemade 7400 into the Open 7400 Logic Competition. A video of it proving his concept is available below. At an earlier post I've said that I didn't have 7400ICs in my drawer. Surprisingly, the local store was saying 74HC00 out of stock. Hence I decided to make...

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7400 competition entry: Ternary base-3 electronics using 74HC4052

Friday, October 21st, 2011

Shaos entered a (balanced) ternary electronic device based on the 74HC4052 into the Open 7400 Logic Competition. Ternary Balanced ternary is a base-3 number system, instead of bits (0, 1, 10, 11, etc), this counts in trits (-1, 0, 1): The "Test bed" consists of 20 sockets for testing "our...

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7400 competition entry: C-IR capture device

Friday, October 21st, 2011

Kevin entered a Detailed consumer IR capture with 74HCxx series chips for the Open 7400 Logic Competition: This is a CIR (Consumer IR / Remote Control) capture device built with 74HCxx series logic chips. It allows a computer to do a detailed capture with carrier frequency, on/off durations, and on...

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7400 competition entry: Discrete Logic Drum machine

Friday, October 21st, 2011

Matt built a fully featured Drum machine for the Open 7400 Logic Competition. Check out the video of its operation and his sound generating skills below. This is a four-channel, sixteen-step percussion synthesizer/sequencer created entirely from discrete logic chips (mostly 74HC-series parts). That's right, no microcontroller or software of any...

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7400 competition entry: Horologium Romanum

Friday, October 21st, 2011

Joe entered his Horologium Romanum into the Open 7400 Logic Competition. It is a clock that displays it's time in Roman numerals built from logic ICs. There is a video of it below. Despite the Roman Empire’s  sanitation, medicine, education, wine, public order, irrigation, roads, fresh-water system, and public health:...

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7400 competition entry: Wheely bin night reminder

Friday, October 21st, 2011

Luc entered his Wheely bin night reminder into the Open 7400 Logic Competition: Because the competition was so open ended in its brief, I placed two constraints on myself: First, I had to make do with the logic chips (and other components) I had on hand. No going to Jaycar...

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7400 competition entry: Heat generator

Friday, October 21st, 2011

After being discouraged by a failed order for their initial entry, Ben and his girlfriend decided to enter a somewhat different design into the Open 7400 Logic Competition. It consists of taking their anger out on 7400 chip. By pumping 1 Amp of current at 12V into the IC, they...

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7400 competition entry: Etch-a-Sketch toy

Friday, October 21st, 2011

Daniel entered an Electronic realization of Etch-A-Sketch toy into the Open 7400 Logic Competition: This project is an electronic realization of the famous Ohio Arts “Etch-A-Sketch” toy, with a twist.  Like the original, two rotary knobs are used to move a cursor horizontally and vertically, respectively, but unlike the original,...

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7400 competition entry: Drum machine

Friday, October 21st, 2011

Christopher created a Drum Machine for the Open 7400 Logic Competition. He also documented it in a video below. The idea for building a drum machine came from a discussion I had with my roommates in which we were talking about the popularity of drum machines as simple web applications....

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7400 competition entry: Accelerometer controlled racing game

Friday, October 21st, 2011

Juan entered an Accelerometer controlled racing game into the Open 7400 Logic Competition. Check out the video of the gameplay below. My project is a simple video game in which you control a car and have to move it sideways in order to avoid obstacles. Via the contact form. (more…)

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7400 competition entry: CD4007-based voice changer

Friday, October 21st, 2011

Reymond entered a CD4007-Based Voice Changer into the Open 7400 Logic Competition: The project uses 2 - CD4007 configured as a Gilbert Cell Double Balanced Modulator and an additional 2 - CD4007 for use as a difference amplifier. This kind of effect is known as a Ring Modulator in the...

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7400 competition entry: Capacitance meter

Friday, October 21st, 2011

[embed]http://www.youtube.com/watch?v=t4OF-N7YvxE[/embed] Alvaro built a Capacitance meter out of logic chips for the Open 7400 Logic Competition. His project measures capacitance of a capacitor and displays it on a 7-segment display. It works by using the said capacitor in a RC oscillator, which changes its output frequency proportionally to the capacitance...

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7400 competition entry: Peltier temperature controller

Friday, October 21st, 2011

Michael entered a TEC temperature controller into the Open 7400 Logic Competition. Logic chips control the temperature of a thermoelectric Peltier element (TEC) heating/cooling plate. Current temperature is measured via a sensor placed directly on the Peltier. The target temperature is set by an 8bit dip-switch. The circuit will cool...

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7400 competition entry: LED clock

Friday, October 21st, 2011

Michael built an LED clock for the Open 7400 Logic Competition. He added 60 LEDs to an analog clock which are controlled by discrete logic chips. This project uses a standard analog quartz clock and adds 60 LEDs clockwise around it to display the seconds. There are 2 selectable modes...

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7400 competition entry: AM radio transmitter

Friday, October 21st, 2011

Andrew entered an AM radio transmitter into the Open 7400 Logic Competition: My 7400 contest entry is an AM Radio Transmitter, which nicely complements another entry. The TX frequency is digitally tunable from 520kHz - 1.6MHz, although this part of the circuit is open loop, so tuning to a specific...

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7400 competition entry: Beeping down counter

Friday, October 21st, 2011

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...

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