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 … Read more
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 … Read more
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.
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 … Read more
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 … Read more
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 … Read more
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.
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 … Read more
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 … Read more
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 … Read more
Udif has entered a CPLD-based 8×8 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 … Read more
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 … Read more
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: … Read more
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. … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more
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. … Read more
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 … Read more
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