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In Reply to: RE: MicroRendu LPSs. posted by AbeCollins on February 25, 2017 at 09:55:54
"The microRendu is $640 and sounds very nice even with the modest $50 iFi wall wart, entry LPS, or batteries for its power source as the microRendu designers went to great lengths focusing on it's internal regulators and power distribution."
Can you point me to documentation that outlines how the MRu is different than any other ARM board. Granted they all are different in some respect [ram, processor speed, etc]. I am curious about this ARM board.
Thanks in advance!
Follow Ups:
There was a detailed discussion on another website and I posted my findings here in the Asylum quite a while ago. You might find it searching the archives.In any case, various voltage regulators, clock, USB, and some other circuits are carefully laid out and separated from the ARM board itself. They reside on the bottom blue board. The header connectors on the bottom board support the minimalist ARM board.
Photos of my open microRendu on the kitchen table
Edits: 02/25/17 02/25/17
I'll look through the archives.
Meanwhile I've been searching the net and came across a lot of good info.
I couldn't find anything 'yet' on how to bypass the internal switching regulator. Do you know if its possible to bypass?
I suppose it could be bypassed but that would likely involve cutting traces on the circuit board.I see nothing wrong with using a switching regulator in the right place. In fact, many switching regulators for their application will outperform linear regulators. Case in point: There are wall warts that use switching regulators with much better performance specs vs the Jameco linear wall wart that I believe you have.
Linear doesn't always mean better.
Edits: 02/25/17
There are some very well spec'd switching regulators. However, they still pollute the ground plane.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~The MRu seems to use a LTM-4625 Switching Regulator, which measures
Line Regulation Accuracy VOUT = 0.04
http://cds.linear.com/docs/en/datasheet/4625fa.pdf
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Would you say these numbers are just as good or better than the Jameco Linear Regulator?
Edits: 02/26/17 02/26/17 02/26/17
I mentioned that the ARM board in the mRendu sits atop the main board (and main power ground plane) via a couple header connectors so it is better isolated from that noise.
I'm not sure why you're posting the chip's line regulation accuracy. The chip has excellent performance in that regard which is a measure of it's output voltage accuracy over a wide range of input voltage. The input voltage in my case would be either 7VDC or 9VDC from an outboard power source to the mRendu.
You should have a look at the chip's ripple voltage spec of 5mV, 50x better than 250mV from the Jameco LPS. BTW, 250mV is a HUGE amount of ripple.
And a load regulation spec of 0.5% vs 6% for the Jameco LPS. More than x10 better.
I'm not picking on the Jameco, just pointing out that LPS specs are not always better than a switcher.
"I'm not picking on the Jameco, just pointing out...."
You say you're not picking on my Jami, but it sure sounds like you're picking on my Jami....:-(
Specs aside, I'm sure it will work and sound just fine. This comes down to how extravagant do these external power supplies have to be for the application - a Pi, mRendu, or similar device.
Contrary to audiophile beliefs and manufacturer marketing spin and brainwashing, I contend that in many cases they can be cheap $10 - $50 wall warts, but that goes against the grain of the high-end hobby. My mRendu sounds perfectly awesome with my $10 wall wart from Amazon, the $50 iFI wall wart, or my 7.2VDC battery pack.
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