Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

Secondary Voltage Question
Secondary Voltage Question
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th September 2014, 10:30 PM   #1
greg7 is offline greg7  United States
diyAudio Member
 
Join Date: Mar 2003
Location: Ohio, USA
Default Secondary Voltage Question

Does the secondary voltage have a major influence on sound quality on the LM1875 and LM3875? I'm using 18V now and I'm curious about 15V. My speakers are highish impedance, however (average of around 12 ohms). Searching this forum and the internet in general hasn't helped much
  Reply With Quote
Old 13th September 2014, 12:19 AM   #2
Arty is offline Arty
diyAudio Member
 
Join Date: Feb 2011
the less the supply voltage, the less the output voltage can be of the chipamp.
less voltage you got on the output, the less it takes to get clipping.
driving a high impedance requires higher output voltage, and therefore higher supply voltage.
so i would say going down to 15 volts from 18 is not a good idea.
  Reply With Quote
Old 13th September 2014, 12:43 AM   #3
greg7 is offline greg7  United States
diyAudio Member
 
Join Date: Mar 2003
Location: Ohio, USA
Quote:
Originally Posted by Arty View Post
the less the supply voltage, the less the output voltage can be of the chipamp.
less voltage you got on the output, the less it takes to get clipping.
driving a high impedance requires higher output voltage, and therefore higher supply voltage.
so i would say going down to 15 volts from 18 is not a good idea.
That was my thought. I've read a few comments about lower supply voltages sounding "softer" (which is something I'm always looking for) but those statements are generally qualified by stating speakers impedances more in the 4-8 ohm range
  Reply With Quote
Old 13th September 2014, 12:46 AM   #4
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
Secondary Voltage Question
i doubt that 3 volts will make a difference....
__________________
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
  Reply With Quote
Old 13th September 2014, 12:53 AM   #5
sreten is offline sreten  United Kingdom
R.I.P.
 
Join Date: Nov 2003
Location: Brighton UK
Hi, None at all, in your particular case, rgds, sreten.
  Reply With Quote
Old 13th September 2014, 04:29 PM   #6
JMFahey is offline JMFahey  Argentina
diyAudio Member
 
JMFahey's Avatar
 
Join Date: Mar 2009
Location: Buenos Aires - Argentina
Agree.
You will have a little less available power, nothing too important acoustically, hard to notice unless you drive your system into clipping such as home DJ on a Saturday night party, but on normal Music enjoying, no big deal.

And no, it won't go "softer" or "harder".
It's a very transparent amp, will faithfully reproduce whatever you throw at it.
  Reply With Quote
Old 13th September 2014, 04:36 PM   #7
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Secondary Voltage Question
This post,
http://www.diyaudio.com/forums/power...ml#post4050991

would help you put numbers in and see what kind of difference you could expect.

Tonality shouldn't change as long as you are well below any clipping point.
  Reply With Quote

Reply


Secondary Voltage QuestionHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to lower the secondary voltage of a transformer myfavoritething Power Supplies 3 20th December 2006 10:30 PM
Secondary voltage for heaters pengboon Tubes / Valves 3 1st February 2006 02:09 PM
secondary voltage vs. primary voltage Stocker Parts 5 11th March 2004 07:41 PM
Toroidal secondary voltage for Aleph Jmertz Pass Labs 6 16th January 2002 07:30 PM


New To Site? Need Help?

All times are GMT. The time now is 10:16 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki