Voltage regulators in parallel

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Hi guys, i'm planning to make a robot which requires 12V,5V and 3.3V power lines regulated from a approx. 15V battery.Would it work if i used 3 voltage regulators(one from 15 to 12V,one from 15 to 5V and another one from 15 to 3.3V) connected in parallel? Or is there another way of getting 3 different regulated voltages from one power source (the 15V battery) thanks. 

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You have several options; here’s two

 

One VR supply with Voltage Dividers

http://www.allaboutcircuits.com/vol_1/chpt_6/1.html

Cascaded VRs

http://www.extremecircuits.net/2010/05/quad-power-supply-for-hybrid-amplifier.html

The links are included as examples, not your actual solution.

3

I would do it just like you

I would do it just like you suggested.   but you need to calculate your current in amps, for each voltage leg to ensure you dont pull more than is rated by each VR.    you could cascade them if you dont over-draw.