Question about Converting 12VDC to 9VDC

Discussion in 'Homework Help' started by jatchan, Apr 14, 2008.

  1. jatchan

    Thread Starter New Member

    Apr 4, 2008
    Hello~~~It's me again.
    My sensor project is done actually. :) However, I wanna use only one DC adaptor to power all 3 of my devices instead of using 3 different ones. The following are the power requirements of them:

    Microcontroller: 12V, 500mA
    Pad: 9V 100mA
    Receiver: 9V 100mA

    BTW, I also want to hook up a rechargeable backup battery to the microcontroller so it could still work for 12hrs even if power is cut out. How can I do that? Is this battery good enough?

    LiFePO4 Li-Ion Module: 12V 1350 mAh (4x18650 4S Flat, 4A rate)

  2. ollie

    New Member

    Apr 11, 2008
    You could use a voltage regulator for the 9V circuits so they could run off the same power supply as the 12V