designing multi voltage power supply

[Maximilien]

Hello,

I am designing a kind of audio preamp that will embed multiple modules.
For that I need to have:

• 5V 3A (For RPi + USB DAC + TouchScreen)
• 9V 1A (For Arduino)
• +/-15V 1A (For RIAA preamp + Line Preamp)

For that what should be the best approach? Should I build a main power supply and add DC/DC rectifiers to provide the wanted voltage for each module? or should I build an individual power supply for each?

Regards

Maximilien

 

[tjerneld]

How many are you going to build ?
Is volume or weight important ?
Tolerances for output voltages ?
A flyback regulator with LT1105, or if you are afraid of RFI from a flyback power supply, then build four series-regulated PS.

 

[Maximilien]

Hi,

Thanks for your fast answer.
First I need to build only one (it is for my personal usage)
Regarding the volume, weight, no it is not very important. all (powersupply and modules) will be put in a 13.4in x 14.5in x 4in
Regading voltage tolerance, for Rpi it is quite sensitive and the 5V must be kept in all time, for the 9v used by the arduino is it very flexible as it is says on the datasheet, and for the RIAA it is based on NE5532 so voltage is flexible, but filtering must be very good to avoid rumple

For all DC, i was thinking about using the LM1084 regulator or LT1084.

Building a flyback regulator may be a bit complicated for me as I don't have enough knowledge about it

 

[mikeAtx]

I've used the little power blocks from Reconn and CUI for Rpi's before. They are little self contained smps. Usually around USD 15 for a 5V 2A from digikey.

 

[Maximilien]

OK, thank you for your replies.
I will start with 3 standalone power supplies