I am developing a data acquisition system.
It is having different analog inputs such as
thermocouples (all types),RTDS(pt-100,etc.),
strain guages and also 4-20ma.current input from various transmitters.
I want to design a commen amplifier which can multiplexed with all these input.
The output of the amplifier then be given to ADC (12 bit),which can be displayed or printed using 89c52 .
Please guide me....