Another idea: Solar-Powered Camera

[bcroe]

1.23V-30V DC-DC Buck Converter Step Down

Switching reg is the way to go; might take some noise filtering on the power leads. DIGIKEY does
quality stuff and a lot of my supply. But likely a running switcher can be picked up for like $3 on
Eb+y, check it out. Bruce Roe

Try this title search, 121258718860 good example I have used. Bruce Roe