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April 30, 2012
News - Home of Tomorrow
about 5 days ago
Nice 3’s Company reference; so very clever of you.
News - Designing a control syste…
about 2 months ago
I was hoping it was a bit more specialized to the task…
Always on the lookout for good tools.
If you need to do timing diagrams, you may wish to check out this tool:
What tool did you use to produce the Arena State Logic state diagram?
Tutorial - BadgerHack
about 2 months ago
In the section “Your First Badger Hack,” you should place a comment above the first delay statement telling users what that delay is for. Right after printing out “Hello world,” we changed the string to something longer and were confused for a bit why only so much text scrolled by before disappearing.
Also, the comment above the scrollText call says to scroll 2 times but the parameter passed is a 1.
We got copies at the 2015 AVC workshop and really like them. I expect they might be offered for sale at some point. Some better documentation of the Sparkfun_LED_8x7 (so you don’t have to open up the header or source files) just to play around would be much appreciated by casual users.
I have v.1.6.3 and replacing the boards.txt file did work. Maybe that helps in identifying the issue and solution.
News - The Race to the Bottom: L…
about 4 months ago
Yes, dougal is correct about 120V AC is the rms voltage.
The power formula being used: power = Vrms*Irms only works if the load is resistive.
I’m expecting in this case that the power factor is not 1. You would want to hook up a scope w/current probe to look at the phase angle between the voltage and current signals.
I would be surprised if the power number on the bulb is not correct. I expect someone, even as a write this, is plugging some bulbs into a lamp socket, which is in turn plugged into one of those socket watt meters like the Kill A Watt, and verifying the numbers.
News - April Caption Contest
about 5 months ago
Heard from outside the trailer after Shawn’s gotten his next generation Redboard idea praised by Atmel:
I haven’t had an orthodox career, and I’ve wanted more than anything to have your respect. The first time I didn’t feel it, but this time I feel it, and I can’t deny the fact that you like me, right now, you like me!
News - New Product Friday: Elast…
about a year ago
Q: How do you pronounce MIPI?
News - According to Pete: Transi…
about 2 years ago
Where’s the love for these transistor configurations? Don’t forget that opamps are merely multiple instantiations and variations of these transistor configurations (you’d need to add current mirrors, too).
Common base? Useless? Look up cascode, a wicked great use of the common base.
Emitter follower? Useless? What do you think is the transistor stage chosen for the output of many non rail-rail output stages? If you look at the size of a discrete transistor versus the size of a whole opamp, when you need more current output than the opamp can source, who you gonna call? Emitter follower, that’s who.
The utility of these configurations is often seen by looking at the input and output impedances of the configuration:
Low input impedances are typically driven with current sources, high input impedances are typically driven with voltage sources.
Low output impedances make great voltage sources, high output impedances make great current sources.
Then you can utilize feedback to accentuate good characteristics and suppress bad characteristics.
News - We Have It In Stock
about 2 years ago
I’m in complete agreement. The setup for the story is complete nonsense.
Good thing for SparkFun is if Nate ever gets lost or can’t fulfill his duties, a similar search for “Nate” on Digikey shows they have 79,780 Nate’s available. If even 10% of those are in stock, SparkFun can always get another Nate. (Well, if by Nate you mean some random RG178 coax cable that matches the search for Nate amongst all the other bogus Nate matches).
No public wish lists :(
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