Sagar E.
2006-10-09 05:21:29 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Use operational amplifier with noninverting feedback. Input resistance of OP amp is huge so it want make any problem to lm35, and then with feedback's resistances make voltage amplification that you need.
2006-10-09 09:29:00 · answer #1 · answered by Marko 2 · 0⤊ 0⤋
Since the LM35 is a temperature sensor, you have to decide: At what temperature do you want the op amp output to be 5v? The scale factor of the LM35 is 0.01v/degC and it's accurate over the range 0 to 100C (ref. 1). If you want 5v at 100C, the output of the LM35 is 1v and you need a gain of 5. For an inverting op amp circuit the output would be -5v and you would use a feedback resistor 5 times the resistance of the input resistor; e.g., 10 Kohm input and 50 Kohm feedback. For a +5v output, there are a few ways to make a noninverting op amp circuit with a desired gain. See ref. 2.
2006-10-09 16:48:09 · answer #2 · answered by kirchwey 7 · 0⤊ 0⤋