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help with 9v to 5v to 3

i am trying to make someting liek this guy made here https://www.instructables.com/id/EZQ7ZDDF0JY1JSH/ where can i find a circuit that will give me outputs of 3v 5v and 9v

schorhr9 years ago
Hello,
a a silicium diode will cause a 0.6v (or 0.65v) voltage drop.
So a basic 9 to 3v could be 10 diods in a series ;-)

For simpler projects a resitor will work just fine, no need for lots of diods.
What you need is a voltage divider:

http://www.play-hookey.com/dc_theory/voltage_divider.html
http://academic.evergreen.edu/projects/biophysics/technotes/electron/resistors.htm

If you need it done right, get one of those voltage supply chips for a few cents. It will take any voltage from 9-15 volt or so and output 5v.
lightpacker9 years ago
not sure about nine but a good idea for about 3 (3.3) volts, exactly 5 volts,and exactly 12 you can try this
https://www.instructables.com/id/E6D9DB9RPPEP286BR9/?ALLSTEPS