Dual Rail regulator.

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PC997

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Joined 2015
Hello All,
I am very new to this and trying to put together a dual rail power supply to power Raspberry PI and Hifiberry Digi Pro.
I purchased 4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2 from Diyinkh.com ( 4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2 - DIYINHK ) and a Talema 70050K 2x7V transformer ( 70050K Talema Group LLC | Transformers | DigiKey ) from Digikey.

I like to use one rail 3.3V for Raspberry and the other 5V to power the HifiBerry Digi-Pro.

Can I use this single transformer in parallel (7V 1.2A each) to power the dual rail regulator (using secondaries seperately)?

Appreciate the knowledge.
 
rayma

rayma

Moderator
Joined 2011
PC997 said:
Can I use this single transformer in parallel (7V 1.2A each) to power the dual
rail regulator (using secondaries seperately)?
Click to expand...

It appears that the two regulators are electrically separate, and have no common connection.
If that is so, then each supply circuit can be powered by one secondary that is full wave rectified
and filtered, like this: Solid State Power Amplifier Supply Part 2
The two grounds must be connected together somewhere, as shown in the schematic.
 
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PC997

Member
Joined 2015
Dual Rail Regulator

rayma said:
Yes, that would be the best point for them to be connected.
Click to expand...

Thank you so much for the information. I drew a simple schematics (attached) on how to hook the Talema 70050K transformer to the dual rail regulator. Can you check? And let me know if there anything else I need to add for possible ground loop?
 

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