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Microcontroller as voltmeter, testing lithium-battery chargers, canceling common-mode voltage, and more
The circuit in "Microcontroller functions as voltmeter," by author Noureddine Benabadji is an extension of his previous Design Idea on how to use an analog input in a microcontroller lacking a built-in ADC (see "Microcontroller, JFET form low-cost, two-digit millivoltmeter"), and it... (more) Details... more...
A hex (code) upon us
In the recent Design Idea "Find hex-code values for microcontroller’s ADC voltages," we flubbed a key formula. The typo made the Design Idea seem less impressive than it actually is and prompted some colorful reader comments.... (more) Details... more...
Photodiode amplifier Design Idea prompts discussion
A recent Design Idea, "Photodiode amplifier exhibits one-third the output noise of conventional transimpedance amp" has prompted an interesting back-and-forth between some inquisitive readers and the author, Glen Brisebois of Linear Technology. See the comments in the "Feedback Loop" section on the right-hand side of the article page, or here's a Details... more...
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