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 Homework help?

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Evan Steeves
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PostSubject: Re: Homework help?   Mon May 09, 2011 12:24 am

I could be 100% wrong but I guess 2v output because of the vss on the same votage in and out cancels maby?
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rdubard
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PostSubject: Re: Homework help?   Mon May 09, 2011 6:25 am

OP AMPS! I love these things.

Short answer: Output will be near 12V positive (slight losses).

Short explanation: In essence, without any feedback, Op amps have infinite gain on the difference between the inputs. In this case, the difference favors the positive, so it drives the output to the maximum available positive voltage supplied.

More detailed: While the 5V on the inverting input drives the output toward the -Vcc 'rail' (which in this case is -12V), the 7V input on the non-inverting terminal drives the output toward +Vcc (+12V), and since 7 is greater than 5, then the positive output 'wins.'

Also, most applications do not use op amps without feedback. With feedback, you have a different gain scheme, and can get analog amplification, with an inverted signal, or in other circuits you can get interesting things like real-time integration or differentiation of the input signal. Read, do the problems, and pay attention in class--you will not regret it!

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SenaiERI
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PostSubject: Re: Homework help?   Mon May 09, 2011 10:28 am

Wow Mr. Dubard, where were you when I took circuits. Great explanation.
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rdubard
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PostSubject: Re: Homework help?   Tue May 10, 2011 6:17 am

I also forgot one of my favorite uses for op amps--oscillators! Wire one up right, and you can make a tunable square-wave oscillator. With a little imagination, you could figure out how a servo tester operates.

and thx, senai!
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rdubard
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PostSubject: Re: Homework help?   Tue May 10, 2011 6:17 pm

No problem! As I said, I love those things.
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