I have a quick question about a circuit I am using to amplify a very small voltage. Any help would be much appreciated. Here is the diagram:
IC2B is configured as a transimpedance amplifier with a high gain. I've built this part and it works fine.
I now want to amplify the output from IC2B using IC1A and IC1B, configured with gains of 1 and 10 respectively. I wish to measure these channels simultaneously with an ADC.
From my naive point of view I have assumed that R5 and R6 are connected to virtual earths. I will choose R5 and R6 to be around 10k to avoid overloading the output of IC2B.
My question is can i connect the inverting input of IC1A and IC1B directly to the output of IC2B without any adverse effects? Are there any obvious improvements i could make?
The circuit is operating at low frequency (maximum ~2kHz).
Thank you for your time.
IC2B is configured as a transimpedance amplifier with a high gain. I've built this part and it works fine.
I now want to amplify the output from IC2B using IC1A and IC1B, configured with gains of 1 and 10 respectively. I wish to measure these channels simultaneously with an ADC.
From my naive point of view I have assumed that R5 and R6 are connected to virtual earths. I will choose R5 and R6 to be around 10k to avoid overloading the output of IC2B.
My question is can i connect the inverting input of IC1A and IC1B directly to the output of IC2B without any adverse effects? Are there any obvious improvements i could make?
The circuit is operating at low frequency (maximum ~2kHz).
Thank you for your time.