help me to find solution for my project

[gogetax1]

hi all, im working on music player that plays via bluetooth, and all i do is mixing electronics togeather.
now, i took a 2w/3.2 ohm speaker, bluetooth head phones and some other parts and i want it to run on battery so i selected the 300mA 9V battery.
the bt board works on 4-5v so for that i need a 5c regulator (i know only the 7805 chip for that) but here is a problem, that ic uses some voltage too, so it will drain up my battery too fast.. is there any other way to decrease the voltage to that 5v i need without taking much resources?

 

[ronv]

You could use one of the switching 5 volt regulators or better yet use 3 AA Or AAA batteries and no regulator.

 

[gogetax1]

yes, but as i said, i need big enough power source to amplify the speaker for a long period.. and the speaker takes some voltage 2.. and i also short of space in my project box.. so what should i do?

 

[ronv]

If the battery must remain the same all you can do is make the regulator as efficient as possible. Like this:

https://www.gravitech.us/35v1aswvore.html

 

[upand_at_them]

A Low Drop-Out voltage regulator will allow you to have a very low difference between the voltage going into the regulator and the voltage coming out.

 

[gogetax1]

this regulator is rly good. but very expencive xD
maybe ill use x2 or even x3 9v batteries for more ampers

and thanks again, i learned new component