To amplify a signal produced by a sensor.
Procedure
The sensor being considered is a LM35 temperature sensor which will produce 10mV per each degree centigrade. The idea is that the signal is too low for purpose, so we amplify the signal to a desirable one.
The desired voltage range in this case is 0-5V. Since the LM35 produces a constant signal at 350mV and a second input of 150mV is required, the gain required for this circuit is 25 times so that the difference between the voltages is 25(150mV) and 25(350mV) = 5V. This can be handled appropriately with a 150k and 6k Ohm resistor.
Data
Conclusion
The operational amplifier handles simple multiplication and subtraction quite simply and a useful signal can always be produced with this handy tool.
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