#### janetsmith2000@yahoo.com

##### New Member

Hi,

I got a circuit for EKG system. It amplifies an input-voltage up to x202 scale. What's the configuration of the circuit below? Any formula to calculate the amplification?

At first i tried to use 2 OpAmps, with Inverting Amplifier configuration (x -10, x -20) and put it in series, in a hope that i could get a scale factor of x200. But the output turns out to be square wave rather than sine wave . LOL could u tell me why?

I got a circuit for EKG system. It amplifies an input-voltage up to x202 scale. What's the configuration of the circuit below? Any formula to calculate the amplification?

At first i tried to use 2 OpAmps, with Inverting Amplifier configuration (x -10, x -20) and put it in series, in a hope that i could get a scale factor of x200. But the output turns out to be square wave rather than sine wave . LOL could u tell me why?