Op-ampology
From Hackteria Wiki
Contents
Basics
This is a subsection of all our experiments related to:
Examples for different Op-amps
LM386
classic...
LM324
Low-Pass filter amp for slow pulse, EKG, action potentials etc
This op-amp circuit is mainly a Low-pass filter and a DC block and can be used to amplify pulse with an LED and LDR or even measuring the heartbeat with electrodes. It can be attached to the arduino.
http://www.swharden.com/blog/2013-04-14-simple-diy-ecg-pulse-oximeter-version-2/
Instrumental Amp for GSR
Example of Instrumental amplifier to measure resistance in plants or on the skin (GSR)
http://www.chris3000.com/archive/galvanic-skin-response/
http://lessnullvoid.cc/pulsum/nuevo-kit-pulsum/