# More Opamps???(aghhh)

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#### Bemcma3

##### New Member
Hey,
Can anyone explain what is occuring within this circuit? i just can't get my head around it...

#### ericgibbs

##### Well-Known Member
hi,
Its a simple non inverting amp.

Gain is 1 + R2/R1

Which part dont you understand.?

#### Hero999

##### Banned
Negative feedback ensures the voltage across R1 is equal to the input voltage.

R1 forms a potential divider with R2.

Look at the schematic below:

$V_\mathrm{out} = \frac{R_2}{R_1+R_2} \cdot V_\mathrm{in}$

Compare it to R1 and R2 on your schematic.

R1 and R2 swap places.

Vin becomes Vout

Vout becomes V(R1).

Draw the above schematic with the modifications described above.

Change the symbols in potential divider formula to match your circuit.

Rearrange so Vin (on the old formula) or Vout on the new formula becomes the subject and you'll have a fomula that should look like the gain equation for your op-amp circuit.

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