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1kΩ 10kΩ Vout V1 V2
What is the output voltage in terms of the inputs? Challenge: Make a circuit that produces an output that is
- nly dependent on the difference, (V1-V2).
10k 1k V out V 1 V 2 Challenge: Make a circuit that produces an - - PowerPoint PPT Presentation
10k 1k V out V 1 V 2 Challenge: Make a circuit that produces an - - PowerPoint PPT Presentation
What is the output voltage in terms of the inputs? 10k 1k 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
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ENGR 40M, Lecture 20:
Building an ECG
Steven Bell
11 August 2017
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Logistics
Lab times next week have changed Homework due next Monday at class time Extra help on Sunday, 2-4pm, STLC 115 Final exam: next Friday, 3:30-6:30, in 200-002
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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.
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Right Ventricle Left Ventricle Right Atrium Left Atrium
To lungs
(Pulmonary artery)
From lungs
(Pulmonary vein)
To body
(Aorta)
From body
(Superior vena cava)
From body
(Inferior vena cava)
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understandingekg.com
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"A noob's guide to ECG" - Slideshare
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12-lead ECG
ecglibrary.com
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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?
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value = analogRead(PIN)
PIN must be an analong-capable input (A0-A5) Result is a 10-bit number, representing 0-5V
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R1 R2 Vout V1 V2 R3 R4
Differential amplifier, again
How much current flows through V1 and V2?
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