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	<title>Circuit Project Electronic &#187; airflow sensitive</title>
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		<title>Air Flow Detector</title>
		<link>http://www.eleccircuit.com/air-flow-detector/</link>
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		<pubDate>Fri, 15 Aug 2008 01:20:12 +0000</pubDate>
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				<category><![CDATA[detector]]></category>
		<category><![CDATA[Air-Gas detector]]></category>
		<category><![CDATA[airflow sensitive]]></category>

		<guid isPermaLink="false">http://www.eleccircuit.com/?p=3250</guid>
		<description><![CDATA[This simple circuit uses an incandescent lamp to detect airflow. With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus lowering it&#8217;s resistance. A comparator is used to detect this difference [...]]]></description>
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		<title>Self-heated transistor digitizes airflow</title>
		<link>http://www.eleccircuit.com/self-heated-transistor-digitizes-airflow/</link>
		<comments>http://www.eleccircuit.com/self-heated-transistor-digitizes-airflow/#comments</comments>
		<pubDate>Wed, 06 Aug 2008 01:12:11 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[detector]]></category>
		<category><![CDATA[Air-Gas detector]]></category>
		<category><![CDATA[airflow sensitive]]></category>

		<guid isPermaLink="false">http://www.eleccircuit.com/?p=3236</guid>
		<description><![CDATA[A sensitive and reliable way to measure airflow is to exploit the predictable relationship between airspeed and the heat dissipated by a sensor exposed to the flow while being held at a constant temperature differential above ambient. The power required to maintain the elevated sensor temperature is proportional to the square root of the airspeed [...]]]></description>
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