The heart and the ECG -- Amplifying the signal

A project log for Heartbeat Logger

A portable device that logs a snippet of your heart at the push of a button.

Ole Andreas UtstumoOle Andreas Utstumo 01/07/2016 at 09:380 Comments

Even though transistors and opamps can amplify small signals, the instrumentation amplifier is preferred for their precision, low noise and excellent common mode rejection.

The instrumentation amplifier will produce a clean (hopefully), centered, single ended signal which will be amplified further by an op amp configured as a differential amplifier.