LM134/LM234/LM334 3-Terminal Adjustable Current Source

Discussion in 'Circuit Help' started by robertradabaugh, Sep 1, 2012.

  1. robertradabaugh

    robertradabaugh

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    Hi, I am look for any low current alternative that I could use that are three terminal adjustable current like the LM134/LM234/LM334. I am mainly looking for alternatives because the simulation program I am using, ni multisim, does not have any spice or models I can use in that environment. All help is welcomed so I can finish this project. Thank you very much.

    Best,

    Bobby
     
    robertradabaugh, Sep 1, 2012
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  2. robertradabaugh

    davenn Moderator

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    hi bobby
    welcome to the forums :)

    3 terminal regulators, say , like the LM317 can be configured as a current source
    do a google search on the LM317 in the datasheet you will find examples of the regulator's use that include a current source

    if after reading through that, any other Q's just ask in this same thread you have started :)

    Cheers
    Dave
     
    davenn, Sep 1, 2012
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  3. robertradabaugh

    robertradabaugh

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    Thanks Dave for the reply and thank you for the welcome. I am glad to be able to get some help. I am going to look over the two data specs on the LM317 and the LM334. (I am printing them out as I type this) While I am doing so what is the main difference between the two?

    Again thank you,

    Best,

    Bobby
     
    robertradabaugh, Sep 1, 2012
    #3
  4. robertradabaugh

    robertradabaugh

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    Hi,

    After looking over the two and looking at the project I am trying to accomplish, I would really like to go with the LM334. The only problem is I cannot find a spice model for it any where so I can complete this circuit. Seems to be a little frustrating. Any help be great. Thank you.

    Best,

    Bobby
     
    robertradabaugh, Sep 4, 2012
    #4
  5. robertradabaugh

    wingnut VIP Member

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    On my free LTSpice simulator one can find the lm334 in the lib/sym/Vreg directory. I got the latest version of LTSpice with many more components by joining the LTSpice group under Google groups.
     
    wingnut, Sep 4, 2012
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  6. robertradabaugh

    wingnut VIP Member

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    Another thing to try is under "my computer" go to your simulator's directory and do a search (all files) for "LM334". It may be found under current source, example circuits and voltage regulator.

    And the LTSpice forum may be under Yahoo groups - just do a Google search for LTSpice forum.
     
    wingnut, Sep 4, 2012
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