How smoke detectors work
Channel: Skills for Survival
Date: 23/05/2016

Kidde KN-COSM-BA Battery-Operated Combination Smoke/Carbon Monoxide Alarm with Voice Warning : http://amzn.to/1XLfJBF

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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