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Jameco's newest Puzzler Answered

Ok guys n gals, I felt good enough this morning to wade through my email, and I found the latest Jameco Puzzler, just waiting for me.

I puzzled over this for about 3 minutes, and then guessed and low and behold.......(see the figure below)

So anyways, HERE is the puzzler, make a guess before looking at the answer :-)
This is NOT a contest, have fun with it....for those that have electronics background, think about it for a bit, remember how an opamp works, and you should be able to get it right on the first guess. Above all though, have fun with it.

Discussions

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V-Man737

9 years ago

LOLOL It didn't accept my answer... Which should have been correct if you imagine my answer, electronically backwards.

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GoodhartV-Man737

Reply 9 years ago

Electronically backwards? Or do you mean the words were in reverse order?

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Goodhart

9 years ago

Oh and btw, if you need an explanation (those that are not electronics geeks), I can provide a simple reason why this would work, in private of course.

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PKMGoodhart

Reply 9 years ago

I would- I don't get the asymmetry involved. I've only used op-amps in signal amplifying mode before with a potential divide as the negative feedback to control the gain.

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GoodhartPKM

Reply 9 years ago

Starting with the Op Amp, a simple definition is: The basic building block of analog signal processing, an op-amp is a solid-state, integrated circuit that has two inputs of opposite polarity and one output.

It works in the setup shown, according to the input signal. The output is completely dependent on it.

Of course you know that the motor, spun in one direction makes it generate a dc current in one direction, and if reversed the polarity of the motor's output (and therefor the input to the op amp) is reversed.

This actually happens with it in amplifier mode too, only the input is not DC, but rather has a waveform, going from pole to pole rapidly.

That is why, some op amps are not really fast enough for sound amplification, while others are much more appropriate for this function: Two I have used for amplification of music are OPA2134 and the AD8066 with the second one preferred.