High resolution versions of pictures, including some that didn't appear in
the Instructable:
Optional feedback capacitor greatly improves stability:
Optionally use a larger power transistor and heatsink if you're driving a
more powerful light source such as a large incandescent light bulb or
extremly high power lED:
Use a transistor socket (solder wires to it):
Going further: Alternate op amp (dual version):
Now you can easily add multiple stages for further gain...
