regulator

Is there such a thing as too much capacitance in a voltage regulation circuit?

I plan to use a pair of  47 uF 50volt caps in my power supply - 'cause that's what I have in my

junk box.  Any problem?  (It will be powering 3 Picaxe08-M's and a L293D motor controller. - power for the motor will be separate)

How do I determine the 'proper" amount of capacitance?

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. 

Hello!

I'm building a board that needs both 3v and 5v as it has some components working on 3v and others on 5v. Now what is the best to do in this case? I am not sure, i've analyzed some of the options but i really do not know the advantages/disadvantages of each:

- have a 5V regulator and a 3V regulator with the input connected to the 5v reg's output (could be done, the 3v reg is low dropout)

- have a 5V reg and some diodes to output 3V (or a voltage divider with resistors)

- have a 5v reg and a 3v reg with both inputs connected to the v+ on the battery 

 Hello, I have a few questions I hope somebody or several people can answer :)

Is there a simple thingy that I can hook up to any voltage higher than 5V (within reasonable range) and always get 5volt out?