Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 23rd April 2005, 07:25 AM   #1
ex192 is offline ex192  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Hamburg
Question Location of rectifier bridge?

I plan to build an amplifier based on the audiosector LM3875 kit with an external power supply.

Are there any disadvantages placing the rectifier bridge in the chassis of the amplifier instead of placing it in the power supply chassis?

Thank's for any comments.
Jochen
  Reply With Quote
Old 23rd April 2005, 08:43 AM   #2
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
I've tried both and it doesn't seem to make any difference!

When I put it in the remote PSU casing, I add some smallish (120 uF) caps to the rails.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 23rd April 2005, 08:35 PM   #3
sek is offline sek  Germany
diyAudio Member
 
sek's Avatar
 
Join Date: May 2003
Location: Berlin
Hi,

EMI would certainly be an issue. But for the sound quality of the amp it should make no difference.

Sebastian.
  Reply With Quote
Old 8th May 2005, 03:40 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
maybe a bit late for input here.
when you separate the PSU from the amp keep the AC with the transformer and maintain DC inside the amp enclosure.
That means rectify and smooth inside the PSU. Then run DC lines to amp. More smoothing inside the amp and decoupling on the rails will help again.
I believe local smoothing and rail decoupling will affect the final sound quality of the amp.
Now my question.
All the decoupling (and local smoothing) should run on separate return lines to the master ground.
All signal returns should also run on separate lines to the master ground.
Where do you put the master ground? In the amp or in the PSU?
My preference is in the amp and run a PSU ground to the master ground (star earth).
The safety ground is only needed in the PSU and can be resistor connected to the PSU ground.
__________________
regards Andrew T.
  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
Bridge rectifier vs Full wave rectifier hilbert_mostert Tubes / Valves 4 28th April 2009 08:26 PM
4 rfb-02 rectifier bridge pcb's BeerCan Swap Meet 1 23rd July 2008 07:07 PM
aleph and bridge rectifier pinial26 Pass Labs 4 13th January 2008 06:11 PM
Integrated Rectifier Bridge VS Rectifier Diodes Sci Chip Amps 11 16th July 2004 02:43 PM
Bridge Rectifier thylantyr Solid State 2 21st August 2003 09:11 PM


New To Site? Need Help?

All times are GMT. The time now is 08:54 AM.


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