HI I am doing a school ECG project, I used the circuit design in the AD620 Datasheet. How come when I implenmented the design, I still get 50 Hz mains frequency?
When I ground the body, I dont get anything displayed on the osciliscope.
Any one can help me?
thanks
1. have you checked the DC condition? - this will point you to where you have made a wiring error.
2. Body? , if you ground the live input you expect to see nothing on your oscilloscope.
Frank
Just about all biometric measurements require a differential amp. The ground connection is made to the ankle or wrist. ( I've forgotten what ECG stands for; Cardio? )