PSU with Multiple 7805 //

Ciu · 19th March 2007, 11:56 PM

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, 09:47 AM

where can I find mentioned schematic

Ciu · 24th March 2007, 02:42 PM

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

R.C.

BWRX · 24th March 2007, 03:17 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, 04:43 PM

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

_Tl431, as the reference source

Any comments ?

Ciu · 24th March 2007, 04:46 PM

Or this one ?

19th March 2007, 11:56 PM	#1
Ciu diyAudio Member Join Date: Feb 2005 Location: Northern France	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.

24th March 2007, 03:17 PM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	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. __________________ Brian

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24th March 2007, 09:47 AM	#2
yusuf diyAudio Member Join Date: Jan 2007	where can I find mentioned schematic

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