Fresh hacks every day
[Nakul], [Nikilesh], and [Nischal] just finished posting about their entry in the 2012 Open 7400 Logic competition. It's an encryption system based entirely on 7400 logic chips. The device operates on 8-bit binary numbers, which limits its real-world applications. But we bet they learned a lot during the development process. The encryption algorithm is based on a the concept of cellular … [Read more...]
This soldering nightmare is a configurable RFID tag which has been built from 7400-series logic chips. The beast of a project results in an iPhone-sized module which can be used as your new access card for security systems that uses the 125 kHz tags. The best part is that a series of switches makes the tag hand programmable, albeit in binary. Of course this is an entry in this year's 7400 Logic … [Read more...]
[Viktor] dredged up a hack he pulled off years ago. His grandfather likes to end the day in front of the TV, but he falls asleep soon after sitting down. Rather than tick away the electricity meter all night, [Viktor] built an automatic shutoff which is akin to a modern TV's sleep feature. At the time microcontrollers were not as easy to source as they are now. So [Viktor] used a circuit based … [Read more...]
The Open 7400 Logic Competition is being held again this year. Start thinking about your entries, they'll need to be finished and submitted by October 31st. As motivation, Digilent has put up two of their Analog Discovery kits as prizes. They can be used as a dual channel oscilloscope, function generator, or 16-channel logic analyzer. Last year was the first time the competition was held. As hype … [Read more...]
[Martin] sent in a great guide to a simple Arduino based theremin. It's a very small build - just a single common IC and some passive components - and easy enough to build in an afternoon. The theremin is based on a simple LC oscillator built around a 7400 quad NAND gate IC, a wire antenna, and a few caps and resistors. When a hand moves closer to the antenna, the frequency of the oscillator … [Read more...]
The component gods must have smiled on [Darrell], because he recently ran into a cabinet full of 7400-series logic chips for sale at his local college surplus. All the regulars were there - flip-flops, logic gates, and SRAMs - in DIP packages. the 7400-series of logic chips gets very esoteric as the numbers increased, so when [Darrell] found a 74ALS679 address comparator, he didn't quite realize … [Read more...]
Confronted with the issue of finding a use for his mounting pile of junk electronics, [Rue] set out to build a persistence of vision device using a hardware state machine. We have a suspicion that his original link may go down if there's too much traffic so here's a cached link just in case. Any board that is MSC-51 or MCS-48 based would have worked for his purposes. This is because the … [Read more...]
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