title: Instrumentation--characteristics of a light emitting diode--transistor photoplethysmograph.
mesh_terms: D004582:Electronics, Medical / Q000295:instrumentation; D007259:Infrared Rays; D010991:Plethysmography / Q000295:instrumentation*; D012666:Semiconductors; D014159:Transducers; D014173:Transistors, Electronic