how do you calculate gain in an op amp if you know the resistance in kΩ? is there some standard methodology or formula i am missing? my text doesnt tell me how it just assumes i know how to. thanks in advance.
we have 2 satandard op-amp amplifier configuration.
one for inverting and one non-inverting.
in inverting amplifier voltage gain is
Av= -Rf/Ri
Rf is feedback resistor from output pin to pin (-).
and Ri is input resistor between input and pin (-).
pin (+) connected to ground.
if we put Rf in kilo ohm in formula then we must put Ri in Kilo ohm too.
and for non-inverting amp
Av= 1+Rf/R2
where Rf placed between output and pin (-)
and R2 placed between pin(-) and ground
pin (+) is input.