OP amp scaling voltage

[MangoKid]

Hey all,

I have been trying to create a circuit to scale a 0 - 3.3v sensor to a 0 -5v signal. Any suggestions on how to do this. I have been trying some Op amp circuits but haven't really gotten anywhere yet.

Thanks!

 

[tpetar]

Op-Amps Part 1: Scaling Sensor Voltages
**broken link removed**

**broken link removed**


Best regards,
Peter

:wink:

 

[MangoKid]

Thanks Peter,

I have tried this circuit with little success. I get the voltage from the divider on the output.

 

[crutschow]

Do you want a 0 to 3.3V sensor signal to be converted 0 to 5V? If so you just need an non-inverting op amp circuit with a gain of 5/3.3 = 1.515. The closest match 1% resistor for that would be R1 = 2.67kΩ and R2 = 1.37kΩ

 

[MangoKid]

Yes I understand that i need and Op amp circuit with a specific gain. I have done this successfully in simulation using an "ideal" op amp (the one you have shown in the circuit) now i have to achieve this with a real Op amp

 

[tpetar]

Yes, Crutschow is right, I didnt pay attention, you need 0-3,3V to 0-5V and non-inverting opamp circuit. I thought it was 0-5V to 0-3,3V.

Best regards,
Peter

:wink:

 

[crutschow]

Yes I understand that i need and Op amp circuit with a specific gain. I have done this successfully in simulation using an "ideal" op amp (the one you have shown in the circuit) now i have to achieve this with a real Op amp

Well originally you said you hadn't gotten anywhere with op amp circuits. :-?

It shouldn't be too difficult if you use a low input offset op amp and the highest signal frequency is well below the Gain-Bandwidth of the op amp. If you have a single 5V supply then the op amp will also need to be an input/output rail-rail type.