amplifier
I am using a 13mv input on a LM324 op amplifier. I am trying to get a gain of about 384 to 5 volts. I am not getting any voltage on the output?? Can anyone offer any suggestions why this circuit doesn't work or point me in the right direction. I have attached a schematic which I hope you can follow.
Any advice would be appreciated.
Many Thanks
simulate this circuit – Schematic created using CircuitLab
Why are you putting +15V on the op amp + input? That will make the output attempt to center around +15V, but it can't output that much. Maybe you meant to ground the op amp + input.
The primary reason that you are not seeing what you expect is that you are trying to operate the part outside of its common mode range. This part is not a rail to rail op-amp. The common mode range from the data sheet is as follows:
When a +5V and -5V set of supplies is used.
Best Answer
By the first look it looks like you are sourcing to much current out of your opamp:
Gives you 100mA maximal output current but the LM324 is only capable of delivering 20 - 40mA.
Try with bigger values like:EDIT: Ok your resistor values are wrong too. The gain of your circuit is:
And not 384.
EDIT2:
As others have pointed out you can't expect 5V on your output because the LM324 is not capable of driving the outputs close to its power rails.