# Homework Help: Omp am prob

1. Dec 2, 2009

### weedannycool

1. The problem statement, all variables and given/known data
if the op amp satuates at +-14v, determne te the range of values of risitance R for which the op amp does not saturate. Assume the op amp is idal

2. Relevant equations

V-=V+

3. The attempt at a solution

this is wa i have so far: (2-5/3)+(2-+14/R). not sure if it is right? COuld some1 help me solve this ?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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2. Dec 2, 2009

### weedannycool

The risistor after the power sorce is a mistake so ignore. thanks

3. Dec 3, 2009

### Staff: Mentor

Welcome to the PF. Could you please be a little more clear about how you derived the start of an equation above? There is at least one "-+" typo in it as well. And an equation needs to have an "=" sign in it, remember.

You have a voltage divider making the voltage at the V+ input, and a variable voltage divider connected to the V- pin. And you correctly state that V+ = V- for an ideal opamp. So that should help you calculate the range of R values that keep the output from reaching +/-14V.