- Jan 1, 1970
Jim Mirra said:I have a circuit that needs 5v and i need to use batteries. How can i use a
9v battery and step is down to 5v?
I don't know what your application is, but many devices that require 5V have
a 'window' of 4.5 to 5.5V. So you could either use 4 AA NiMH batteries
(4X1.2V=4.8V), or you could use a 9volt battery and a chip called a 7805
voltage regulator, which would regulate the 9volts into 5volts provided it
is connected correctly. The 7805 draws some idle current, so you would need
to measure that and figure out how long the 9v battery will last.