in fig 1 we see that there are 2 diodes between the 2 input ,and these for protect the input of OPAMP so it will never the difference between 2 input be more than .7v ,my question is why we connect no inverting input to 10k to ground and not connected direct to ground?
and also in the second OPAMP we connect the 2 diodes after 47k? so why this
and in fig 2 we connect 200k parallel with .01uf ,so is this low pass filter and how can I chose the value of 200k and .01uf
and also in the second OPAMP we connect the 2 diodes after 47k? so why this
and in fig 2 we connect 200k parallel with .01uf ,so is this low pass filter and how can I chose the value of 200k and .01uf