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That should be a linear driver, and I think those projects exist on the forum
The P3 has a few features that makes it a little harder to DIY than a regular linear driver, such as the 7s start up delay and interlock for FDA compliance.
EDIT: I think someone should make a DIY bench supply circuit that can supply really high currents, from a LiPo source (instead of AC), with both coarse and fine voltage and current adjustment knobs.
This project is still ongoing - http://laserpointerforums.com/f39/feeler-high-current-psu-pcbs-83429.html#post1204631
If you would like to take a stab at it let me know, I've got all the design files and it's 80% done.
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