instrumentation amplifier using lm348 for differential EEG sensor

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sahana3

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Hello friends,

I have to design an amplification circuit of gain of 20,000. i have been using lm348 as an instumentation amplifier. please help me design it. searched on net and found the circuit but that gives a square wave when the input given to both the non-inverting inputs of 2 opamp the same sine wave.

Regards
Sahana
 

You obviously have something wrong. Post a schematic.
 

Also, what is your input voltage? With a gain of 20,000 and, for example, a Vcc of 10volts, a 500uV input will drive your amp into saturation.
 

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