temperature sensor circuit using lm335

Posted on Feb 7, 2014

This is a design circuit for a temperature sensor circuit that uses an LM335, an IC that converts the ambient temperature into an equivalent output voltage. The voltage output of an LM335 increases by approximately 10 mV for every 1 degree Kelvin of rise in temperature. Note that 1 degree Kelvin is equal to 1 degree Celsius. This is the figure of

temperature sensor circuit using lm335
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the circuit; In this circuit, the output of the LM335 is fed into a 741 op-amp (any standard op-amp may be used) which is configured as a voltage follower. As such, the output of the 741 is the same as the voltage output of the LM335. The main function of the op-amp, therefore, is just to buffer the LM335 output so that it is not affected by whatever load is connected to this temperature sensor circuit. This circuit can be used for measurement purpose.

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