Hello,

In attachment below, I have an op amp which takes in 4 vdc and outputs 5vdc. The circuit has been calculated by using the non-inv op amp formula:

vo = [1 + rf/ri] v2

5 = [1 + 15k/10k] x 2

However, if I ramp up the input from 4vdc to 6 vdc, I measure 7.5vdc at the output when the input reaches 6vdc. Which for me.. its a nice ramp.

But my question is, in the world of op amps, what if one wants the output to be 5 to 10 vdc when the input ramps from 4 to 6 vdc respectively???

I don't seem to be able to do this intuitively or by any of the formulas I know.

Can someone please help me achieve this and by showing a simple circuit... ?

thanks

24v

In attachment below, I have an op amp which takes in 4 vdc and outputs 5vdc. The circuit has been calculated by using the non-inv op amp formula:

vo = [1 + rf/ri] v2

5 = [1 + 15k/10k] x 2

However, if I ramp up the input from 4vdc to 6 vdc, I measure 7.5vdc at the output when the input reaches 6vdc. Which for me.. its a nice ramp.

But my question is, in the world of op amps, what if one wants the output to be 5 to 10 vdc when the input ramps from 4 to 6 vdc respectively???

I don't seem to be able to do this intuitively or by any of the formulas I know.

Can someone please help me achieve this and by showing a simple circuit... ?

thanks

24v

#### Attachments

Last edited: