[XCSSA] Integrating with components that have differing voltage requirements

[X-otic Computer Systems of San Antonio]

Hi,

I'm finally back home and decided to get back to work on the balloon project again.  I decided to build two APRS trackers: one with 100% off-the-shelf components/wiring and another that is built on a custom PCB from SMT components.  I'm a little stumped by a power issue that I'm facing with the PCB.  Each component has a particular voltage requirement.  The GPS wants 3.3V regulated.  The OpenTracker+ SMT wants 5V regulated (or 6V-28V unregulated).  Not to be outdone, the SRB MX146 miniature radio wants 8V.  

I'm still really new to electronics but it seems that I have only two choices: separate power supplies for each component or switching voltage regulators for each.

I've considered just assembling a 12V battery rig and using three of these:

http://www.dimensionengineering.com/DE-SWADJ.htm

Can I run three of these off of one bank of batteries?  Is it as simple as connecting the Vin lines of each regulator to the +12V terminal of my battery block?

Is there a better way to do this?

FYI, here are the three components I'm trying to run:

Radio:  https://www.argentdata.com/catalog/product_info.php?cPath=25&products_id=81
OpenTracker+ SMT:   http://www.argentdata.com/products/otplus.html
GPS:   http://www.sparkfun.com/commerce/product_info.php?products_id=8146

Cheers,

Chris Snell

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