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-   -   PSU with Multiple 7805 // (http://www.diyaudio.com/forums/power-supplies/98481-psu-multiple-7805-a.html)

Ciu 19th March 2007 10:56 PM

PSU with Multiple 7805 //
 
Hello !

I saw in the schematics of the PSU for DAC's output, something unusual .
The audio output stage(one side) is made with 2 OP Amp AD712, mounted in differential ; the PSU is made of 2x 7815 (Pos rail), 2x 7915 (neg rail )
I don't know why 2 voltage regulators TO220 (1.5A each !) connected // are needed ? Is there any advantage in such topology ?

Thanks for any advice
R.C.

yusuf 24th March 2007 08:47 AM

where can I find mentioned schematic

Ciu 24th March 2007 01:42 PM

PSU 7815
 
2 Attachment(s)
This is the scheme, with 2 x 7815 (not 7805) connected // to supply One AD712

R.C.

BWRX 24th March 2007 02:17 PM

Theoretically lower output impedance... although I don't know how much it would help considering there are already two large electrolytic caps on the output.

Ciu 24th March 2007 03:43 PM

7815 Reg
 
2 Attachment(s)
I intend to swap these regulators, with a home-made board, a lm317 (better output noise ) and caps ,solid tantalum 20f on output.
For the ajusting level output, I have the choice :
_Resistors with 10 cap //

_Tl431, as the reference source

Any comments ?

Ciu 24th March 2007 03:46 PM

7815 Regulators
 
2 Attachment(s)
Or this one ?


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