Amplifying the signal from a LM35

Discussion in 'General Electronics Chat' started by kayawemo, Feb 4, 2011.

  1. kayawemo

    Thread Starter New Member

    Feb 21, 2007
    1
    0
    does anybody know how i can amplify LM35 output to about 10 volts?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    I found this post in the Electronics Tips and Tricks thread.

    Now you have your own thread.

    The LM35 is giving a signal of 10 mV / °C.
    How much do you want to amplify the signal?

    Bertus
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    I found this in an email:

    As I do not answer emails, I will do it here.

    You will need an opamp that amplifies 10 times.
    The powersupply must be higher than this 10 volts in order to work properly.
    Best is to take an opamp with rail-to-rail in and output capability.
    This spreadsheet contains a list of rail-to-rail opamps from national:
    Operational_Amplifiers_|_Rail_to_Rail_Input.xls.txt
    (remove the .txt and load it in excel from microsoft or in calc from the free open office).

    Bertus
     
    Last edited: Feb 4, 2011
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    Well, depending on what need for the output voltage controls my op amp gain. Simple as that.

    What do you want for the output?
     
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