A kit that may be helpful for modders / experimenters.
Based on an LM317 voltage regulator.
LM317 - 3-Terminal Adjustable Regulator
Kit of parts with circuit board. Can be changed to output 4.4v or whatever by changing one or two resistors or adding a zener diode (see the LM317 datasheet).
Active Robots - Sparkfun Breadboard Power Supply - UK
Could be made adjustable over a desired output voltage range.
Suitable for mods with 2 batteries (6v+) or usb where you would prefer a lower voltage for your atomizer.
Based on an LM317 voltage regulator.
LM317 - 3-Terminal Adjustable Regulator

Kit of parts with circuit board. Can be changed to output 4.4v or whatever by changing one or two resistors or adding a zener diode (see the LM317 datasheet).
Active Robots - Sparkfun Breadboard Power Supply - UK
Could be made adjustable over a desired output voltage range.
Suitable for mods with 2 batteries (6v+) or usb where you would prefer a lower voltage for your atomizer.
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