I need to design a simple 20 mA current source, can any one tell me how do i do that
K Thread Starter khanna_gunjan Joined Jan 29, 2006 8 Apr 27, 2006 #1 I need to design a simple 20 mA current source, can any one tell me how do i do that
hgmjr Joined Jan 28, 2005 9,027 Apr 27, 2006 #2 One fairly simple solution would be to design a current mirror. Below is a link to the tutorial on this website that explains this technique using an simple example. Current Mirror Tutorial After reviewing the information in this tutorial you can then consider the things you need to decide on in addition to the 20ma current source value. For example, what dc voltage do you have available to use in generating this current source From your post, it seems safe to assume that you are just looking for a constant 20 ma source. Is this a safe assumption? hgmjr
One fairly simple solution would be to design a current mirror. Below is a link to the tutorial on this website that explains this technique using an simple example. Current Mirror Tutorial After reviewing the information in this tutorial you can then consider the things you need to decide on in addition to the 20ma current source value. For example, what dc voltage do you have available to use in generating this current source From your post, it seems safe to assume that you are just looking for a constant 20 ma source. Is this a safe assumption? hgmjr
K Thread Starter khanna_gunjan Joined Jan 29, 2006 8 Apr 27, 2006 #3 Current Mirror Tutorial For example, what dc voltage do you have available to use in generating this current source From your post, it seems safe to assume that you are just looking for a constant 20 ma source. Is this a safe assumption? hgmjr [post=16614]Quoted post[/post][/quote] yes thats right, and the available voltage is 5 V dc.
Current Mirror Tutorial For example, what dc voltage do you have available to use in generating this current source From your post, it seems safe to assume that you are just looking for a constant 20 ma source. Is this a safe assumption? hgmjr [post=16614]Quoted post[/post][/quote] yes thats right, and the available voltage is 5 V dc.
beenthere Joined Apr 20, 2004 15,819 Apr 27, 2006 #4 Hi, Get the spec sheet for an LM317 adjustable voltage regulator. It will show you a way to set it up as a current source.
Hi, Get the spec sheet for an LM317 adjustable voltage regulator. It will show you a way to set it up as a current source.