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-   -   Optimal voltage for 2x4? (http://www.diyaudio.com/forums/minidsp/195400-optimal-voltage-2x4.html)

Frosteh 26th August 2011 09:51 PM

Optimal voltage for 2x4?
 
What is the optimal power supply voltage for the 2x4 unbalanced? USB is 5V, but I have seen various posts on the minidsp forum suggesting that 12V is better.

Frosteh 27th August 2011 05:28 PM

anyone?

trevmar 28th August 2011 02:48 PM

I measured my miniDSP 2x4.
When applying an external voltage to the green connector, I tested over a range of 10V to 24V. The required current dropped as the voltage rose, as is typical with a switching power supply. I seem to remember the total current was less than 100mA even at the lowest supply voltages.

So there really is no optimum voltage, the switch supply will take any voltage up to its rated maximum, and process it efficiently.

Hope that helps :)
.

Frosteh 28th August 2011 04:40 PM

Quote:

Originally Posted by trevmar (Post 2688982)
I measured my miniDSP 2x4.
When applying an external voltage to the green connector, I tested over a range of 10V to 24V. The required current dropped as the voltage rose, as is typical with a switching power supply. I seem to remember the total current was less than 100mA even at the lowest supply voltages.

So there really is no optimum voltage, the switch supply will take any voltage up to its rated maximum, and process it efficiently.

Hope that helps :)
.

Indeed that does help. Do you assume it'd be the same with 5V?

trevmar 28th August 2011 04:46 PM

I didn't test below 10V. I would be surprised if the 5V level was very sensitive, I haven't noticed any problems when plugging the USB plug into a power adapter which I know is closer to 4.5V than 5V :)

Frosteh 28th August 2011 05:45 PM

Quote:

Originally Posted by trevmar (Post 2689100)
I didn't test below 10V. I would be surprised if the 5V level was very sensitive, I haven't noticed any problems when plugging the USB plug into a power adapter which I know is closer to 4.5V than 5V :)

Awesome thanks for your help! I ordered a 5V switching psu off ebay earlier so hopefully that will be fine to power all the miniDSP's and a few LED's

minidsp 29th August 2011 01:13 AM

Already well answered by Trevmar, just a short post to indeed confirm that there are no optimal voltage as the on-board switching regulator will indeed do its magic.

DevTeam

hm4nine 29th August 2011 07:10 PM

I have my (personal) problems with switching supplies, based on hearing experiences. May be I am an “old analog guy“. It would be nice, if minidsp could supply instructions, how to overcome their switching supplies on their boards.....

minidsp 31st August 2011 07:40 AM

@Hm4nine,

Apologies but we're not sure to understand the question.
Are you asking how to remove the switching regulator (running @ 1.25MHz so well above audio band) to run your own linear supply for the 3.3V?

Not sure you would get a great benefit on this one...

DevTeam

hm4nine 31st August 2011 10:53 AM

My intention goes mainly towards the analog supply part of the output stage, where some linear opamps probably need a symmetrical supply. May be there won´t be any audible difference between switched and analog supplies for the 3.3 Volts. Because the 2x4 kit has only one supply input all internal voltages must be generated from that single voltage.


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