Fresh hacks every day
[Chris] over at PyroElectro is getting into the swing of the holidays with a LED Christmas tree build. Unlike the other electrical Christmas trees we’ve seen this holiday season, [Chris] designed his tree entirely with digital logic – no microcontrollers included.
The tree [Chris] constructed on a piece of perf board is a beautiful spiral arrangement of 64 green … Read the rest
Homebrew CPUs made out of logic chips are nothing new, but a homebrew FPGA is another matter entirely. [Joshua] sent in a project he whipped up where he made a single logic cell FPGA.
Despite how complicated and intimidating they are in practice, FPGAs are really very simple. They’re made of thousands of logic blocks capable of transmuting into … Read the rest
When [GG] was 12 years old, he was introduced to BugBooks, the wonderful ‘introduction to digital design’ books from the early 1970s. It has always been a dream of [GG] to build the TTL computer featured in the BugBooks, and now that he has the necessary time and money available to him, the Apollo181 has become a reality.
[GG]‘s … Read the rest
The dollar store is always a great place to find some weird stuff, so when [jethomson] found a flickering Jack-o’-lantern, he thought it would make a great project for the 74xx logic competition.
Instead of using the flickering incandescent lightbulb that came with the blinking pumpkin, [jethomson] decided to rebuild a blinking circuit around a 74HC14 Hex inverting Schmitt … Read the rest
[Bertho] might have outdone himself this time. He built a Lights Out clone for the 7400 logic competition.
Lights Out is an electronic toy sold by Tiger in the mid 90s. The goal of the game is to turn a 5 by 5 grid of light up buttons off. There’s a catch, though – pressing a button toggles the state … Read the rest
Have a penchant for pain? Why not destroy your fingertips with a wire-wrap tool building a video card made entirely out of discrete components.
When [Chris] decided to build an entry for the Dangerous Prototypes 7400 logic competition he already had his hands full. The 74xx chips he had on hand had a maximum clock frequency of 25MHz, but … Read the rest
[Bertho]‘s submission for the 74xx logic contest is really impressive. He designed a capacitive sensing touchpad using only 74xx and 40xx logic chips. We’re impressed with the build and his writeup is one of the best resources we’ve ever seen for capacitive sensing.
There are two ways to go about designing a capacitive touchpad. The first option is put … Read the rest
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