EPISODE · Mar 8, 2011 · 3 MIN
How smoke detectors work
from Engineerguy videos & audio · host Bill Hammack
Bill takes apart a smoke detector and shows how it uses a radioactive source to generate a tiny current which is disrupted when smoke flows through the sensor. He describes how a special transistor called a MOSFET can be used to detect the tiny current changes.
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How smoke detectors work
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