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### Topic: Hard amplifier problem - Pleease anwer (Read 6590 times)previous topic - next topic

#### anb2020

##### Jan 03, 2013, 12:45 amLast Edit: Jan 03, 2013, 01:39 am by anb2020 Reason: 1
http://i.imgur.com/qmNBA.jpg

#### Osgeld

#1
##### Jan 03, 2013, 01:17 am
its not that hard, and its not a transistor

#### retrolefty

#2
##### Jan 03, 2013, 01:21 am
School must be back in session, and I like trick questions.

#### MarkT

#3
##### Jan 03, 2013, 01:28 am
I don't know how to anwer...
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

#### anb2020

#4
##### Jan 03, 2013, 01:41 am

its not that hard, and its not a transistor

yupp it's an amplifier .. solve it please!

#### MarkT

#5
##### Jan 03, 2013, 01:52 am
But its clearly a homework problem you're passing on to us - if you at least had a go at answering
it first it wouldn't be so galling - people like to help, but cheating isn't helping, its avoiding understanding.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

#### anb2020

#6
##### Jan 03, 2013, 02:01 am

But its clearly a homework problem you're passing on to us - if you at least had a go at answering
it first it wouldn't be so galling - people like to help, but cheating isn't helping, its avoiding understanding.

It is a challenge from the teacher ..
He said you can get help from anyone .. But I need you to understand the solution ..
I guess nobody knows how to solve it : (

#### justjed

#7
##### Jan 03, 2013, 02:57 am

I guess nobody knows how to solve it : (

Turn that frown upside down! There are pages and pages of op-amp instruction on the web. The 1st result I clicked on provided a very important clue in re. that circuit diagram.

its not that hard, and its not a transistor

From the drawing: 'All steps must be based on knowledge that we all know through mechatronics or before.' Hmmm, doesn't look like a Transformer either.
... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier

#### retrolefty

#8
##### Jan 03, 2013, 03:03 am

But its clearly a homework problem you're passing on to us - if you at least had a go at answering
it first it wouldn't be so galling - people like to help, but cheating isn't helping, its avoiding understanding.

It is a challenge from the teacher ..
He said you can get help from anyone .. But I need you to understand the solution ..
I guess nobody knows how to solve it : (

Nice try and I will give you bonus points for being persistent.

Why don't you check out any op-amp introductory primer, it should be simple to figure out the answer.

Lefty

#### anb2020

#9
##### Jan 03, 2013, 03:22 am
Thaaanks guys
I really hope I can solve it ..

#### oric_dan

#10
##### Jan 03, 2013, 04:03 am
Lefty recognized the trick part right off - this is a problem in electronics, not mechatronics.
You're in the wrong classroom.

Also, your instructor tricked you - it's a really a trivial problem. As everyone here obviously
knows [except OP], you go to the basics for opAmp operation, and then solve for the special
case.

Quote
I really hope I can solve it ..

We all hope you can solve it too.

#### anb2020

#11
##### Jan 03, 2013, 04:13 am

Lefty recognized the trick part right off - this is a problem in electronics, not mechatronics.
You're in the wrong classroom.

Also, your instructor tricked you - it's a really a trivial problem. As everyone here obviously
knows [except OP], you go to the basics for opAmp operation, and then solve for the special
case.

Quote
I really hope I can solve it ..

We all hope you can solve it too.

You all know the answer?!?!?! I feel like an idiot!

#### Osgeld

#12
##### Jan 03, 2013, 06:21 am
thats cause we all read the very short basics of an opamp

hint google basics of an opamp
hint opamp
hint opamp basics

#### oric_dan

#13
##### Jan 03, 2013, 07:18 am
Quote

Oops, photon torpedo supposed to blow up Romulan ship, not Klingon ship.
Locutus reporting for duty. Assimilate me, now.

Quote
thats cause we all read the very short basics of an opamp

hint google basics of an opamp
hint opamp
hint opamp basics

OP, actually, there are several tricks your instructor played on you. So, here's more hints,

1. can you solve the ckt if you change the + and - terminals around? [then it works more
normally, can you explain why?].

2. can you explain the difference between positive and negative feedback?

#### westfw

#14
##### Jan 03, 2013, 07:31 am
Major clue (?): http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampi.html
"The inputs draw no current."

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