I need help with this one. I'll give parts needed and a description of what I need.

Parts:

1 op amp
1 cap
Resistors
1 POT

Can you draw me a noninverting amp that will take a 500mV p-p low level signal and amplify it to 100mV p-p to 2V p-p (adjustable)

I was just wanting to see what any of you guys or girls come up with. I want to compare it to mine and see if mine is correct or not.

The trouble I have, is that in my mind I don't think you can get out 100mV p-p. Mainly because gain is determined by RF/R1 +1 right. So even if you had a gain of .1 on the inverting, +1 you would get 1.1. With an output voltage of .550mV p-p.

After thinking about it for awhile, I finally came up with putting a voltage divider on the noninverting input. If I am right, I don't know. That's why I am asking you.

Thanks.

__________________
\"If Noah had been truly wise, he would have swatted those two flies\" Joe Blaschka

 

Potential divider will work just fine as you want. Just keep the gain of op-amp to 4 so that when the input is 500mV and the potential divider is set for minimum attenuation, the output will be 500*4=2000mV=2V.
To get 100mV for 500mV input, adjust your potential divider such that the input signal to NI pin is 25mV. The output is this case will be 25mV*4=100mV.

Bye the way where are you going to use that capacitor which you mentioned in your list?

__________________
"There is no way to peace, peace is the way!"

 

Since I'm putting in a AC signal, I'm using the cap to block DC coming in on the noninverting input.

__________________
\"If Noah had been truly wise, he would have swatted those two flies\" Joe Blaschka