More Opamps???(aghhh) - Electronic Circuits Projects Diagrams Free

Bemcma3 · 14th August 2009, 07:59 AM

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

ericgibbs · 14th August 2009, 08:14 AM

hi,
Its a simple non inverting amp.

Gain is 1 + R2/R1

Which part dont you understand.?

Hero999 · 14th August 2009, 10:44 AM

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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14th August 2009, 07:59 AM	#1
Bemcma3	More Opamps???(aghhh) Hey, Can anyone explain what is occuring within this circuit? i just can't get my head around it...

14th August 2009, 08:14 AM	#2
ericgibbs	hi, Its a simple non inverting amp. Gain is 1 + R2/R1 Which part dont you understand.? __________________ Eric " Good enough is Perfect " I will NOT answer PM's requesting technical help, please use the Forum PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/

14th August 2009, 10:44 AM	#3
Hero999	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. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.