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January 29, 2008
about 4 months ago
Does this work with 3.3V IO or is 5V required? The garmin spec isn’t clear, other than to say the i2c can run “up to a maximum of 5V”
about 3 years ago
Calling this output “gray code” obfuscates. This type of output is commonly called quadrature.
about 4 years ago
Can anyone comment on the noise level of this supply? I see one comment below about noise being 20 mVpp and virtually no load. That doesn’t bode well for higher loads. Is it really that high?
about 5 years ago
milspecguy, I studied a fair bit after reading your post…and ordered a QA100. it’s a nice scope. I really, really wanted a logic analyzer with the scope, which tipped me towards the QA100. If I didn’t need logic analyzer, then I’d get a Chinese standalone scope since these prices on those are amazing right now (glad to see SparkFun is starting to carry those)
But man, now that I have the protocol analyzer (and a built in sig gen), it’ll be tough to go back to a regular scope.
here’s a good write up on the QA100.
You’ll outgrow this scope pretty quickly. I bought this from Sparkfun in Sept 2009, and a month later was regretting it. And prior to this, I had a Parallax scope which I regret buying too. Bite the bullet and spend a bit more on a scope that has a real front end and that can also do protocol analysis. They cost $100 more, but you’ll get an extra analog channel and some additional digital channels to boot.
Both the Link and Parallax scopes suffer from cheap front ends and too basic software. As you try to look at smaller signals, you’ll begin to see the stairstepping as these devices don’t have any programmable gain in the front end. And the software relies on USB com port emulation which is slow.
No public wish lists :(
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