Laser cutter owners may find this online box design tool which [Jon] built quite useful. It's got a few more joint options than the Inkscape box design add-on does. Apparently the US Navy has the ability to bring down drones in a flaming pile of laser-caused death. [Thanks Joshua] [Michail] has been working on a transistor-based full adder. He's posted a Spice simulation if you want to learn … [Read more...]
2-bit full adder using just thirty six 555 timers
February 28, 2011 By 10 Comments
This 2-bit adder was a lot of work to build. It uses a total of thirty-six 555 timers and it does have the option of adding or subtracting numbers. It's a rather unorthodox use of the part, depending more on the chip as an inverter and taking advantage of the fact that there's an NPN transistor built into it. [cpu86] did use some PNP transistors to give him the ability to turn off some of the … [Read more...]
Intermediate Concepts: Building discrete transistor gates
January 20, 2011 By 19 Comments
[Simon Inns] has put together a lesson in digital logic which shows you how to build your own gates using transistors. The image above is a full-adder that he fabricated, then combined with other full adders to create a 4-bit computer. Don't know what a full adder is? That's exactly what his article is for, and will teach you about binary math and how it is calculated with hardware. There's … [Read more...]
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