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Experiment 8 Report
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Introduction The basic challenge in this design is to convert the current from the temperature sensor (1 ºK = 1uA) into a voltage. More specifically, we want two separate voltages, one which is .0... 1* ºK and the other .1* ºF. Then in the second part we need to design a temperature controller that will light up a red LED if the temperature drops below 68 ºF (6.8 V) and green if it goes above 72 ºF (7.2 V) Circuit Design and Analysis For the circuit design, we used LF412 operational amplifiers. Signal Conditioning for ºK: In order to model the temperature sensor output, we simply used a DC voltage source with a 10 kΩ resistor, which means a 1 V input will produce 100 uA (this should correspond to 100 ºK). We used a simple inverting amplifier used as a current to voltage converter, where VO / IS = - RF. Since we want 0.01 ºK at the V01 output when IS = 1 uA, RF should be 10 kΩ. This is an inverting amplifier, so in order to get a positive voltage we simply reversed the polarity of the DC source, so the positive terminal was toward ground (IS would be going toward ground). In order to adjust for any error, we had to incorporate a +-1 ºK offset adjustment. This was done by adding a 1.5 MΩ resistor connected to the inverting terminal, then [Show More]
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