Op Amps

Discussion in 'The Projects Forum' started by sirch2, Jan 24, 2014.

  1. sirch2

    Thread Starter Well-Known Member

    Jan 21, 2013
    1,008
    351
    Hi,

    I'm interested in building an anemometer like the one shown in the circuit below. However the ADD8704 does not seem to be readily available. What should I look for in finding an equivalent Op Amp? I.e. what parameters are important so that I don't have to redesign the circuit? The ADD8704 data sheet is here - http://www.analog.com/static/imported-files/data_sheets/ADD8704.pdf


    [​IMG]
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,154
    3,060
    It looks to me like the first 3 bullets on the data sheet are what I would focus on:

    Single-supply operation: 4.5 V to 16.5 V
    Upper/lower buffers swing to VDD/GND (rail to rail)
    Continuous output current: 35 mA

    I think the 35mA output is not really required but it shouldn't be hard to just include that as a spec.

    You don't care much about speed - this is not an AC application.
     
    Last edited: Jan 24, 2014
  3. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    Looking at the schematic there is an other opamp given : tlv2434.

    You might also want to have a look at the following page for some more info on thermal anemo meters:
    http://www.fonema.se/anemom/anemom.html

    Bertus
     
  4. sirch2

    Thread Starter Well-Known Member

    Jan 21, 2013
    1,008
    351
    wayneh - thanks

    bertus - thanks and well spotted on the op amp, I must look at these things more closely. That's also a very interesting web page.
     
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