Just cause I wanted to, and also if it work, it may power future projects that I might fancy, I decided to design up a Power Supply Unit which supplies the 2 most common digital logic voltage levels using either 2 rechargeable or single use AAA batteries.
With a single non rechargeable AAA battery measuring in at 1.5v and a rechargeable AAA 1.25v, 2 of them in series would give me a max 3v. To get it up to 5v, I started looking for a Boost Converter.
I eventually settled on the MAX1674 SMPS, mainly because it was cheap and had fairly good efficiency at higher load levels.
I then stepped the 5v down to 3.3 using the RT9198/A linear regulator.
Throw in an LED to indicate that everything is running smoothly and walah~! Behold the design!!
The board is 26mm x 16mm
All that’s left now is to actually build it and test it…