I'm building a simple project that consists of a 9v LED, a 5v Gas Sensor and a 3.3v micro controller. All the devices have low current draw, so I'm not really worried about hooking them up in parallel.
I was thinking that the 9v LED could be directly connected to a battery. In parallel with that I would like a 5v and 3.3v voltage regulator, where both of the voltage regulators would power the other two components.
I've looked at this thread: Power Supply Design - Multiple Voltage Regulators but got some mixed signals regarding hooking up the voltage regulators in parallel or series, and was wondering if anyone could give me a definitive answer on best practice? Additionally, I've seen some articles that encourage bypass capacitors to help smooth out the DC signal, because I'm connecting directly to a battery I can ignore that, correct?
The LED is a MegaBrite (https://www.sparkfun.com/products/10236)
The gas sensor is a MQ-3 (https://www.sparkfun.com/products/8880)
and the microcontroller is an MSP430 (breadboard/launchpad version)
Thanks for your help!