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Old 24th October 2007, 06:58 PM   #1
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Default Upgrade Marchand PS?

I'm wondering about upgrading the PS110 power supply in my Marchand XM44 active crossover. The parts list is:

2 249 Ohm 1%, 1/4W, Metal Film
2 2.94K 1%, 1/4W, Metal Film
2 10.0K 1%, 1/4W, Metal Film
2 1000 uF, 50V Electrolytic
4 47 uF, 50V Electrolytic
14 1N4937 1A Hi Efficiency Diode
2 LM317 Regulator

There's a photo and schematic at http://www.marchandelec.com/ftp/ps110man.pdf

Do you think I could get a performance boost by upgrading any of these parts? What would you suggest? I'm not too concerned about cost, but any changes I make will have to be physically similar, so I can use the same pcb and remount the board in the XM44.
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Old 26th October 2007, 02:12 PM   #2
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Bump! Surely someone will help? This looks like a pretty standard ps. What can I improve?

I'm skeptical about replacing metal film resistors. What do you think?
Would Shottky diodes be an improvement?
Black Gates electrolytics would seem to be an obvious upgrade?
What about the regulator?

Am I in the right forum?
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Old 26th October 2007, 05:05 PM   #3
Gordy is offline Gordy  United Kingdom
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It's a bit difficult to comment without seeing the overall circuit diagram. Is this supply fed to each stage, or are there secondary regulators feeding each stage of the unit?

Although it's standard advice, I would say reducing the output impedance of the regulator stage is always advantageous. Have a read of these pages at TNT; start here http://www.tnt-audio.com/clinica/reg..._noise1_e.html and here http://www.tnt-audio.com/clinica/reg...edance1_e.html
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Old 26th October 2007, 07:05 PM   #4
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No secondary regulators. There's a diagram in the XM44 construction manual. (Note that I have a different power supply than the one in the photo).


I'll read the TNT links. Thanks Gordy.
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Old 27th October 2007, 11:40 AM   #5
djk is offline djk
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A good supply.

Candidates for the Darwin Award should not read this author.
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