Rank: Member
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Joined: 6/30/2009(UTC)
Posts: 10
Location: Denmark
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Hi, I have just purchased the Opus Dac together with 4:1 MUX SPDIF and Metronome. I have some 5V regulated supplies from NewClassD - http://www.newclassd.com/index.php?page=34 which I would use for those boards. However the Opus dac reguires 7,5V - but I thought that I could remove the LP2985AIM5-5.0 for analogue supply (make a connection between pin 1 and 5) and then connect 5V to each of the suppplies. Would this be an good solution? Shall each board have their own regultated PSU to give the best sound? I will also replace the clock on the Metronome with a reference clock from NewClassD as well.
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Rank: Advanced Member
Groups: Member
Joined: 6/12/2008(UTC)
Posts: 79
Location: Norway
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Hi. The regulators you are refering to are meant as a drop in for 78XX, 3 pin regulators. What you are suggesting is to use it as a replacement for the onboard regulator in the Opus. I guess you might make it work, but most likely not as good as the original.... You would have too look into the values of the capacitors around the regulator (C14, 16 and 18). Since you will have to remove the regulators from the board, you will get a less than optimal layout. And you still would have to have a PSU board..
Looks like those regulators might be a possible upgrade for the LM317/337 regulators in the LCDPS/LCBPS PSU´s though.
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Rank: Administration
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Joined: 10/24/2006(UTC)
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I think you would end up with worse performance. They best the performance of an LM7805, but that's not that hard to do.
I would need to look, but I am not sure they would even be better then the LM317, which itself has much better specs than the LM7805.
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Rank: Member
Groups: Member
Joined: 6/30/2009(UTC)
Posts: 10
Location: Denmark
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Hi,
Thanks for your input.
Well there is a need for a regulated power supply for the Opus DAC anyway and looking at the LP2985s then the seem to have same problem with ripple rejction in the low frequency range as the 78xx - maybe at a different level though. I was just thinking as I have the 5v UWBs then I could just use them instead of getting something else. Of course the UWB will be put on a board with fast Schottky diodes and Nichicon Muse caps in front and after to stabilize. How is the noise rejection vs frequency for the LCDPS/LCBPS?
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