mickduckett Posted March 14, 2007 Report Share Posted March 14, 2007 hi im 14 and am half way through my planning of a gcse project however i am stuck on what componants i would need to use to make a heat sensor that is sensative enough to detec a 1 degree change in temperature CAN ANYBODY HELP ME??? ??? Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 14, 2007 Report Share Posted March 14, 2007 There are temperature transducer ICs available.An ordinary silicon diode has its forward voltage drop about 3mV for each degree C rise in temperature.PTC resistor.NTC resistor. Quote Link to comment Share on other sites More sharing options...
Ldanielrosa Posted March 15, 2007 Report Share Posted March 15, 2007 Let me tell you about two of my favorite temperature sensors.The LM334 is a programmable current regulator. It is nominally a three pin device that is commonly available in TO-92 package. This varies current linearly with respect to temperature on the kelvin scale.The LM335 is a temperature sensitive voltage reference. It is also a three pin device in a TO-92 package. Usually only two pins are used, the third is available for trimming. The voltage is 10mV/kelvin.Both are available in TO-46 packages as well, which includes broader operating range and usually tighter tolerance. Quote Link to comment Share on other sites More sharing options...
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