ucd180 enough power? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 19th May 2006, 12:58 PM   #1
bcrazy is offline bcrazy  Norway
diyAudio Member
 
Join Date: Oct 2005
Default ucd180 enough power?

My sansui au-x701 just blew up it's power supply. I may decide on building a new amplifier with 2xucd180 or 2xucd400. The question is do i need the power of the ucd400.

The sansui was 2x100w at 8 ohm, and had very good bass control. I also uprated the power supply condensors from 2x15.000uF to 2x75.000uF.

For me the sansui had just enough power for my speakers.

Will the ucd180 bew powerful enough or should i go for the 400?
  Reply With Quote
Old 19th May 2006, 01:39 PM   #2
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
Well your Sansui was 100W into 8 ohms, the UcD180 is 180W into 4 ohms so potentially could be as low as 90W into 8 ohms. I doubt you will notice any difference. The Sansui is probably a bit over rated anyway, and I very much doubt it can do 180W into 4 ohms even if the PSU was up to it.

As you need a new PSU anyway, that is where most of the attention should be focussed. Especially as you can build it such that it will really do 180W into 4 ohms, which will be far more than the Sansui could manage.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 19th May 2006, 01:47 PM   #3
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Default Re: ucd180 enough power?

Quote:
Originally posted by bcrazy
For me the sansui had just enough power for my speakers.

Will the ucd180 bew powerful enough or should i go for the 400?
Think decibels also. You will get 3 dB more out from UcD400, hardly noticable if we only talk about the sound level.

If money is not an issue maybe you should go for UcD400? Both Bruno and Jan-Peter have hinted about the more advanced circuitry of the UcD400.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Tube Buffered Gainclone in work |Thread || Diamond buffer |Thread for the group buy | Wiki
  Reply With Quote
Old 19th May 2006, 02:31 PM   #4
Banned
 
Join Date: Jan 2005
Bridge four UCD700 modules for stereo
  Reply With Quote
Old 20th May 2006, 07:19 AM   #5
MOER is offline MOER  United States
diyAudio Member
 
Join Date: Aug 2003
Location: SIMI VALLEY CA
Default ucd

The UCD power is soley determined by the power supply

If you put a UCD180 or a 400 on a +/-40v rail, they will deliver the same power!
  Reply With Quote
Old 20th May 2006, 09:35 AM   #6
bcrazy is offline bcrazy  Norway
diyAudio Member
 
Join Date: Oct 2005
Ok

The UCD180 is rated at 105Watts in 4 ohms with a +/-45 supply
How high can i go before i trip the overvoltage supply at 52 V?

I read another post here by MOER and he said 48 volts vould trip the overvoltage.

Hypex says 50 volt is max.
How much power will it give with 50V, provided it's possible to run that high voltage.

Will the sound quality decrease when you exceed 45 volts?
  Reply With Quote
Old 21st May 2006, 08:31 PM   #7
diyAudio Member
 
Join Date: Dec 2005
Location: Berlin
Default Re: ucd

Quote:
Originally posted by MOER
The UCD power is soley determined by the power supply

If you put a UCD180 or a 400 on a +/-40v rail, they will deliver the same power!
Is this evidence based or just a guess??
Would there be any disadvantages doing this?
  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
Ignoring power output: UcD700 vs. UcD400 vs. UcD180 elg2001 Class D 6 5th February 2007 08:53 PM
Too light power supply /UCD180? Pasi P Class D 6 16th November 2006 09:26 AM
probability of success with ucd180+diy power supply mazurek Class D 3 9th November 2005 06:04 AM
UcD180: Switching Power Supply? jhenryc Class D 3 11th March 2005 09:12 PM
Toroidal Power Transformers - UcD180 dmfraser Class D 2 3rd October 2004 02:03 PM


New To Site? Need Help?

All times are GMT. The time now is 06:58 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