LM134/LM234/LM334 3-Terminal Adjustable Current Source

[robertradabaugh]

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

 

[davenn]

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

 

[robertradabaugh]

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]

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

 

[wingnut]

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]

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.