Opamp help

Discussion in 'General Electronics Discussion' started by Badejavu1, Jan 6, 2016.

1
0
Jan 6, 2016

File size:
357.7 KB
Views:
109

13,676
1,892
Sep 5, 2009
3. BobK

7,682
1,686
Jan 5, 2010
This sounds like homework.

The way to analyze op amp circuits is to determine an equation for the + input and one for the - input. To a good approximation, these will be equal, because, if not, the difference will be multiplied by 1,000,000 or more and sent to the output, which will put the output at the + or - rail.

So write down the two formulae for the + and - inputs, then equate them, and you should have an equation for involving Vout, Vin1 and Vin2. For the 5V case, just substitute 5 for Vin1. Then solve for Vout.

Bob

4. CDRIVEHauling 10' pipe on a Trek Shift3

4,960
648
May 8, 2012
It's possible that he did and fortunately got a hit on EP.

Chris

5. davennModerator

13,676
1,892
Sep 5, 2009
which I didn't see and why I gave several links for him to follow up on

6. CDRIVEHauling 10' pipe on a Trek Shift3

4,960
648
May 8, 2012
I guess my point is we never know what new member might someday be an EP shining star. So we should be glad when they decide to check here first. We have more than enough collective brain power to help them without directly doing their homework.

After all, many of us may deny this but reality is most if not all EP VIP contributors are here because we have IMMENSE egos. Except me of course! I'm humble..

Chris

davenn likes this.
7. Ratch

1,088
331
Mar 10, 2013
Which gain? The gain of v1 or v2? Incremental gain or static gain? r1, r2, and v1 sets the voltage at the + and - terminals of the op-amp. Then is a simple matter of solving a node equation as shown below.

Ratch

8. CDRIVEHauling 10' pipe on a Trek Shift3

4,960
648
May 8, 2012
Ratch, PM Marty and let him know this is here. He loves equations! You can tell him I sent you.

Chris