What is the output voltage in terms of the inputs? 10k Ω 1k Ω V out V 1 V 2 Challenge: Make a circuit that produces an output that is only dependent on the di ff erence, (V 1 -V 2 ).
Di ff erential ampli fi er With correct choices for R 3 and R 4 , we can make this amplify the di ff erence between V 1 and V 2 . R 2 R 1 R 3 V out V 1 V 2 R 4
ENGR 40M, Lecture 20: Building an ECG Steven Bell 11 August 2017
Logistics Homework due next Monday at class time Extra help on Sunday, 2-4pm, STLC 115 Lab times next week have changed Final exam: next Friday, 3:30-6:30, in 200-002
By the end of today, you should be able to: Describe the main components of our ECG Explain what an instrumentation amplifer is, and why it's not an op-amp.
To body From body (Aorta) (Superior vena cava) To lungs (Pulmonary artery) From lungs (Pulmonary vein) Left Atrium Right Atrium Left Ventricle Right Ventricle From body (Inferior vena cava)
understandingekg.com
"A noob's guide to ECG" - Slideshare
12-lead ECG ecglibrary.com
You're trying to build an ECG. What capabilities does your circuit need? What does it need to be able to do (and not do) to work?
value = analogRead(PIN) PIN must be an analong-capable input (A0-A5) Result is a 10-bit number, representing 0-5V
Di ff erential ampli fi er, again How much current fl ows through V 1 and V 2 ? R 2 R 1 R 3 V out V 1 V 2 R 4
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