Best way to make a Constant Power Load

What would be the best way to make a load that always draws the same amount of power whatever the voltage on it. For exemple, an load would draw 100 mA at 24 VDC, 150 mA at 18 VDC and 200 mA at 12 VDC. All I found is to use Nonlinear Dependant source.
Any easier way to do this? Thanks.

Sorry about the file mix up, I was anxious to get it posted for you that I failed to realize you were using a different version.
As far as the last "amplifier" in your Leaky Feeder design, I actually hooked it up to the 24VDC supply on the left and this was a direct connect before the first resistor. I realize this is not what would be ideal for your application as probably you have only a certain place in the Leaker Feeder to tap off from. I would suppose this would be going into a different entry way off the main entry at an intersection so I do not know how my adjusting the placing of this would effect the results because it seems to me by doing this I have bypassed a bunch resistance in the Feeder cable itself (if that is what the resistors represent) and also bypassed a number of amplification stages in the process as well.
I will post a picture of my circuit for you to examine and try in Version 9. This is the only thing I could come up with to where the power draw was the same no matter what the voltage input was. The only thing I can see as a drawback is that with this circuit the current remains constant but the voltage fluctuates. If I use a 24V regualtor and drop the input voltage to 12V the current remains at approx 118ma but the voltage drops to 12V when I plug it into your circuit.. I will let you try it and see what you may be able to do with it.
Message Edited by lacy on 04-28-2008 05:47 PM
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Attachments:
Possible Constant Power Load.JPG ‏285 KB

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