Gadgetech's recent blogs on test thoroughness reminded me how some faults are found only because a specific method is followed, along with a bit of luck. This tale also demonstrates the beauty of a four-channel scope that sees almost everything that goes on simultaneously.
Recently I was working on the design of a simple quadrature upconversion module for a Software Defined Radio (SDR) front-end. What it did was fairly straightforward -- take the baseband I and Q outputs from a direct-conversion receiver (an ADRF6850) and feed these to two modulators (the good old MC1496), configured as I and Q modulators, then combine ...
In some previous blogs, we've discussed iOS apps, oscilloscope and other, as well as remotely controlling a scope from a device. Now, I want to get a cheap Android tablet to see what it can do in this arena. But you need to help me pick one.
I really like microprocessors and microcontrollers, little chips with the only goal in life to do your bidding. And I keep wanting to do one interesting project or another, though never seem get around to it. But I plan to change that.
Engineers of a certain vintage (I won't say how old except you had to be around in the late 1970s or early 80s) might remember the Tek 4051 desktop computer, or the venerable Tek 4014 graphics display terminal. The graphics came in only one color -- green -- but the quality of the picture was superb, and these terminals were popular in engineering ...
Believe it or not, every Radio Shack -- hell, almost every drugstore -- once had a tube tester sitting at the back, available for all to use. Pulling a bunch of tubes out of a malfunctioning radio or TV, and heading off to test them, was always an exciting little excursion!
5/19/2013 1:28:19 PM
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MD on Choosing a Cheap Android – Help!
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