Optimal voltage for 2x4? - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > miniDSP

miniDSP Low cost, modular Digital Signal Processor (DSP) kits for the DIYer from miniDSP.

Reply
 
Thread Tools Search this Thread
Old 26th August 2011, 09:51 PM   #1
Frosteh is offline Frosteh  United States
diyAudio Member
 
Frosteh's Avatar
 
Join Date: May 2011
Location: Kirkland, WA
Default 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.
  Reply With Quote
Old 27th August 2011, 05:28 PM   #2
Frosteh is offline Frosteh  United States
diyAudio Member
 
Frosteh's Avatar
 
Join Date: May 2011
Location: Kirkland, WA
anyone?
  Reply With Quote
Old 28th August 2011, 02:48 PM   #3
trevmar is offline trevmar  United States
diyAudio Member
 
Join Date: Jan 2011
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
.
  Reply With Quote
Old 28th August 2011, 04:40 PM   #4
Frosteh is offline Frosteh  United States
diyAudio Member
 
Frosteh's Avatar
 
Join Date: May 2011
Location: Kirkland, WA
Quote:
Originally Posted by trevmar View Post
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?
  Reply With Quote
Old 28th August 2011, 04:46 PM   #5
trevmar is offline trevmar  United States
diyAudio Member
 
Join Date: Jan 2011
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
  Reply With Quote
Old 28th August 2011, 05:45 PM   #6
Frosteh is offline Frosteh  United States
diyAudio Member
 
Frosteh's Avatar
 
Join Date: May 2011
Location: Kirkland, WA
Quote:
Originally Posted by trevmar View Post
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
  Reply With Quote
Old 29th August 2011, 01:13 AM   #7
minidsp is offline minidsp  Hong Kong
diyAudio Member
 
minidsp's Avatar
 
Join Date: Dec 2009
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
__________________
www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp
  Reply With Quote
Old 29th August 2011, 07:10 PM   #8
hm4nine is offline hm4nine  Europe
diyAudio Member
 
Join Date: Mar 2005
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.....
  Reply With Quote
Old 31st August 2011, 07:40 AM   #9
minidsp is offline minidsp  Hong Kong
diyAudio Member
 
minidsp's Avatar
 
Join Date: Dec 2009
@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
__________________
www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp
  Reply With Quote
Old 31st August 2011, 10:53 AM   #10
hm4nine is offline hm4nine  Europe
diyAudio Member
 
Join Date: Mar 2005
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.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2 2x4 or 1 2x8 MiniDSP Frosteh Digital Line Level 6 23rd August 2011 12:25 PM
2x4 in Box with 24/96 or 24/196 aazeez1975 miniDSP 3 8th July 2011 10:40 AM
2x4 brace matrix curiousburke Subwoofers 3 7th December 2007 02:40 PM
Optimal ripple voltage on b+ supply nhuwar Tubes / Valves 14 1st February 2007 05:01 PM
Math to calc optimal voltage of tube dac to match amp input sensitivity? riotubes Tubes / Valves 7 9th November 2006 11:08 PM


New To Site? Need Help?

All times are GMT. The time now is 06:52 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2