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adjustable current source

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gehan_s

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hey all

i need an adjustable current source other than lm334(i searched online but could only find that). my specs are 10mA constant current with an operating voltage of 1 to 35V, through hole and cheap :-D

thanks in advance
 

other than lm334
without a justification this is a completely arbitrary requirement like "it must come in a green package".
 

You could use a TL431 shunt regulator as shown in Figures 31 and 32 of this data sheet. These are inexpensive and can use an inexpensive general purpose NPN transistor such as a 2N2222, but I see no advantage of that over the LM334 unless you need to go over 10mA or the voltage rating of the LM334.
 
you can use LM317 Lim.png
 

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