Current Sources

When I need a current source.

Would you like to ask your question in a way that gets a sensible answer? I can only guess what's going on in your head that you don't know the answer already.

Some, but not all, reasons to use a current source:

1: You want a current that's independent of the voltage -- 0V or 100, you need that current.

2: You're modeling a sensor or a load or some other physical process that tends to be constant current.

3: Part of your circuit will be a current source of some sort but you don't want to simulate that part -- so jam in a current source and be done.

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Tim Wescott 
Wescott Design Services 
http://www.wescottdesign.com

Google: 'long-tailed pair' perhaps?

A controlled current source and a cap makes a nice integrator.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Chris seems to ask some broad question, and then go away. George H.

Homework question?

news:nb7rn2$n10$ snipped-for-privacy@dont-email.me...

"The magnet is held to prevent it from rotating, while the disc is spun on its axis. The result is that the galvanometer registers a direct current. The apparatus therefore acts as a generator, variously called the Faraday generator, the Faraday disc, or the homopolar (or unipolar) generator." See:

Such generator has a big current but very low voltage. S*

But it's hardly a current source.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics