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Archive for the ‘7400 contest’ Category

Nottingham Hackspace “days accident free” counter

Tuesday, January 15th, 2013

Fowkc tweeted a picture of his somewhat late open 7400 competition entry. It's a giant 3 digit 7 segment display used to count the number of day's there hasn't been an accident in his local hackerspace. You can read about it's development on his blog. Back in September 2011, Dangerous...

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Open 7400 first prize winner receives his Analog Discovery bench tool

Wednesday, November 28th, 2012

Matseng shows off the prize he got for taking first place in this years open 7400 contest with his "Constant load with nixie readouts" entry. He chose to get one of the Analog Discovery bench tools Diligent was kind enough to sponsor the contest with. Analog Discovery is a 100...

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Posted in 7400 contest, tools | 8 Comments »

Congratulations 7400 contest winners email sent

Monday, November 12th, 2012

An email went out to winners a few hours ago. If you didn't get it please let us know through the contact form. A copy of the email is below. (more…)

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Posted in 7400 contest, contest | 9 Comments »

Open 7400 Logic Competition winners 2012

Friday, November 9th, 2012

Thank you participating in the Open 7400 Competition. All the entries were amazing! Check out the full list here. This year we tapped community members to judge, and gave great weight to the readers' choice. The projects with the most votes were awarded prizes. Winners will receive prize information by...

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Posted in 7400 contest, contest | 16 Comments »

7400 competition: Entries and reader’s choice

Wednesday, November 7th, 2012

Here’s a (hopefully) complete list of entries in the Open 7400 Competition. Please share your favorites in the comments below, your favorites will receive a special reader’s choice prize. Voting ends in 24 hours. A few commentators will receive free PCB codes as a thank you for voting. Check out...

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Posted in 7400 contest, contest | 131 Comments »

7400 competition entry: Lighting effects generator

Tuesday, November 6th, 2012

  Dmitriy entered his lighting effects generator into the Open 7400 Competition. The basis of the device is a multi-bit digital sequence generator that is implemented on a serial shift register [1]. The repetition period of the sequence is determined by the number of bit of a register and much...

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7400 competition entry: Animated LCD name tag

Tuesday, November 6th, 2012

T0mpr1c3's open 7400 Logic Competition entry is the Doctored calculator animated name plate: Here is another single chip dead bug offering. The circuit has been out there for at least a decade. Check out the video after the break. (more…)

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7400 competition entry: Build your own FPGA

Tuesday, November 6th, 2012

Nick's Open 7400 competition entry is an FPGA that is implemented in 7400 series discrete logic ICs: Building a microcontroller or CPU out of discrete logic is a popular hobbyist pursuit, and it serves a useful purpose. Building a CPU from scratch teaches you a lot about CPU architecture and...

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Posted in 7400 contest, contest | 1 Comment »

7400 competition entry: I2S DAC with a Class D amplifier output

Tuesday, November 6th, 2012

This I2S DAC with a Class D amplifier output has been entered into the open 7400 competition. It uses a mix of 74HCxx and 4000 CMOS series logic ICs to achieve the desired result. My last minute entry to the 7400 series logic competition. I'm using a SN74HC132 hex NAND...

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7400 competition entry: Signal strobe

Tuesday, November 6th, 2012

Check out Matthew's 7400 contest entry, a 74xx based signal strobe for emergencies, as well as search and rescue situations. This a signaling strobe, an enhanced one with a siren. My device is built off of 7400 NAND Quad Gate, 2x 7476 J/K Flip Flop, 7432 OR Quad Gate and 4x...

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7400 competition entry: A CPLD-based 8×8 game-of-life

Tuesday, November 6th, 2012

Udif has entered a CPLD-based 8x8 game-of-life into the 7400 Contest. As can be seen on the picture, the design uses 3 of our CPLD breakout boards, which you can grab at Seeed for $15. The project was coded in Verilog, using many small modules. The reason for that was...

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7400 competition entry: Constant load with nixie readouts

Tuesday, November 6th, 2012

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...

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7400 competition entry: Periodic egg turner for incubator

Monday, November 5th, 2012

Do you need an incubator for hatching eggs?  T0mpr1c3 shows you how to easily make a homemade egg incubator: This is a project from a couple years ago, which I published on the members' pages at the Backyard Chickens forum: An automatic egg incubator with PID temperature control and periodic...

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7400 competition entry: The polonaise machine

Monday, November 5th, 2012

[embed]http://www.youtube.com/watch?v=uv7_yqEWP1g[/embed] Check out Jussi's 7400 contest entry, the polonaise machine. It's a sound generator with the Telemann's Polonaise tune incorporated into the design. After about half an hour of brainstorming I came up with the idea of a modern musical box. In a few moments I had the core of...

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7400 competition entry: Class D amplifier using digital logic

Monday, November 5th, 2012

Class D amplifier using digital logic is the open 7400 competition entry by hasn0life: The entry is a class D amplifier made entirely out of discrete digital logic components. I took great pains not to use op amps or transistors or any active devices besides logic gates. Though the amplifier...

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Posted in 7400 contest, contest | 2 Comments »

7400 competition entry: A nixie-based Press Your Luck game

Monday, November 5th, 2012

[embed]http://www.youtube.com/watch?v=ZGUu_32GjhY[/embed] It's time to Press Your Luck! Check out Christopher's nixie-based Press Your Luck game for the Open 7400 Logic Competition : Press Your Luck (tv game show) in Nixie form, getting a W (view the tube upsidedown) is like getting a Whammy. See how many points (other cathodes) you...

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Posted in 7400 contest, contest | 2 Comments »

7400 competition entry: Frequency counter

Saturday, November 3rd, 2012

Here's a 6 digit frequency counter by Yi, entered into the Open 7400 Competition. During the Winter break my dentist convinced me that I needed to have my 2nd wisdom teeth removed. Having done this previously without much pain, I thought it would be a good idea. It turned out...

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7400 competition entry: 40xx logic chips project

Saturday, November 3rd, 2012

Nakul Rao I, Nischal Rao, Nikilesh, and Sandesh VS entered a bicycle exercise meter and burger alarm into the Open 7400 Competition. Their project keeps track of your bicycle's speed, cadence, and distance while you're exercising. It also acts as a burglar alarm when you're away. This is something we...

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7400 competition entry: CMOS car alarm

Saturday, November 3rd, 2012

Don't wanna lose your car? Build a CMOS 4000 series car alarm and enter it in the open 7400 competition. Built way back in the 1980s this CMOS Car Alarm provided an entry & exit alarm for my wonderful little Mini. It was built from CMOS series logic to reduce the...

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7400 competition entry: Using two CD4007 IC as an op amp to generate sine waves

Saturday, November 3rd, 2012

[embed]http://www.youtube.com/watch?v=3DHwaFE4kA4[/embed] Here's an interesting way of designing analog devices using digital chips. This sine wave generator s based around mosfets contained in the CD4007 IC (a dual complementary pair of mosfets and an inverter). The CD4007 dual complementary pair and inverter is primarily intended for digital logic circuits. It contains an inverter,...

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