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SparkFun will be closed for Memorial Day (5/30). Orders placed after 2pm MT on Friday (5/27) will process and ship out on Tuesday (5/31).

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Madbodger

Member Since: January 12, 2008

Country: United States

Profile

Programming Languages

C, Java, XSLT, assembler

Expertise

Vacuum tubes, neon, microcontrollers, electronics

Interests

Neon, reading, building, making

Websites

http://www.vitriol.com/ http://bodger.dreamwidth.org/

  • Saying the lithium cells have more energy density than coin cells is odd, as coin cells are also lithium cells. Also, another option to get 5V from a single cell is a DC-DC converter.

  • I’m a little unclear why a 3-axis controller comes with 4 stepper motors. It’s like hot dogs and buns.

  • I doubt they want to release it with a share-alike license, as then they’d have to release circuit diagrams, source code, sound files, etc. and they may well have used some licensed content there. Some attribution would have been nice, however.

  • I too must disagree. You make the point that learning to program a microcontroller has benefits elsewhere. This is true, but learning how passive analog components actually work and how the math behaves also has benefits elsewhere. The fact that the 555 can run on a wide voltage range, run on dirty power, and source or sink a whopping 200mA also makes it a low parts count solution for many problems. The original (bipolar) version is also very robust, and will operate reliably in an environment full of interference and voltage spikes. While I agree that microcontrollers have encroached on much of the territory the 555 originally held, there are still plenty of niches where it’s still arguably the reasonable choice. Hans Camenzind (the designer of the 555, alas no longer with us), wrote an excellent book on IC design. At the end, he revisited his own 555 design, explaining how he’d do it differently with decades more advancement and experience. But the original design persists.

  • Done. What’s your address?

  • But that’s a different product: Pick and Place Spare Parts Grab Bag

  • Integrated circuits aren’t really “just one type” of transistor (some early ones like PMOS were), but modern ones normally have at least two kinds of transistors, and often many more. Also, “Identification” is misspelled.

  • I love the skill levels required!

  • Realize that while .01% error sounds pretty good, that is only one part in eight of the legal limit. However, the fuel cell based BAC readers are generally more accurate than the (probably) tin oxide sensor Shawn used.

  • It goes back farther than that. The CMU coke machine reported it status a long time ago. https://www.cs.cmu.edu/~coke/history_long.txt