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Old 19th March 2007, 11:56 PM   #1
Ciu is offline Ciu  France
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Default 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.
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Old 24th March 2007, 09:47 AM   #2
yusuf is offline yusuf  India
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where can I find mentioned schematic
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Old 24th March 2007, 02:42 PM   #3
Ciu is offline Ciu  France
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Default PSU 7815

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

R.C.
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Old 24th March 2007, 03:17 PM   #4
BWRX is offline BWRX  United States
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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.
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Old 24th March 2007, 04:43 PM   #5
Ciu is offline Ciu  France
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Default 7815 Reg

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 ?
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Old 24th March 2007, 04:46 PM   #6
Ciu is offline Ciu  France
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Default 7815 Regulators

Or this one ?
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