CURRENT MEASUREMENTS

R503 FPM:

When VCC is connected to a 3.31V supply, FPM draws 13.8mA of quiescent current. When
VCC is disconnected (3.3VT connected to 3.31V supply), it draws 2.9uA. 

ATmega328P:

MOSFET:


FS5106B high-torque servo:

One of them draws 6.1mA when connected and stabilizes at 4.6mA. The other drew
variable amounts initially (4.7mA, 5mA+, but mostly 4.7). Both draw 4.6mA of
quiescent current with a 5.07V supply.

REMARKS

 1. Can't use the 3.3V FPM modules with Arduino Uno. The RX and TX lines have
    resistors. 
 2. When ATmega328P is in power down mode, the MCU + FPM + Servo + linear
    regulators draw 30.6mA of quiescent current at 5.07V.