Bypass mur860 diodes with caps? - diyAudio
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 30th October 2004, 05:25 PM   #1
diyAudio Member
 
Join Date: May 2004
Location: Toronto, Canada
Default Bypass mur860 diodes with caps?

Hi there,

I was wondering if bypassing the mur860 diodes was a good idea. I've actually already tried this with 680 pf caps on a LM3886 gainclone. The sound seems a lot more relaxed than before. Can someone verify this? Is this a good thing or not?

Thanks for your help,
300_baud
  Reply With Quote
Old 30th October 2004, 05:32 PM   #2
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Somebody told me recently that using these snubber caps on the rectifier bridge is good for higher frequencies and not so good for lower frequencies.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 30th October 2004, 06:05 PM   #3
diyAudio Member
 
Join Date: May 2004
Location: Toronto, Canada
So what values are people using to bypass their diodes? Like i mentioned in my first post, I'm using 680 pf.

Thanks again
  Reply With Quote
Old 30th October 2004, 06:45 PM   #4
w00t is offline w00t  Singapore
diyAudio Member
 
Join Date: Aug 2003
Location: Singapore
I'm using 0.1uF X2 caps (Rifa PME271M). They are surplus from my Quietline project.
  Reply With Quote
Old 30th October 2004, 06:53 PM   #5
diyAudio Member
 
Join Date: May 2004
Location: Toronto, Canada
Well, just wanted to report that the sound opened up, especially the treble. The transparency is about the same now as how it was without the caps on the diodes. Even though it is as transparent as before the caps, the treble doesn't feel as "sharp and as hard hitting" as it used to, which to me is a good thing. It's like the frequency response in the upper frequencies is more linear now.

Anyone else want to report their findings?
  Reply With Quote
Old 30th October 2004, 07:09 PM   #6
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Quote:
So what values are people using to bypass their diodes?
22n.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 30th October 2004, 09:11 PM   #7
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I had MSR860 in a DAC and there were there 0.1u orange caps across each diodes. I removed the caps later and the sound became much cleaner. I prefer it without caps.

But it may be circuit/system dependant, so do whatever you prefer.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 30th October 2004, 09:56 PM   #8
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Why do I always have a feeling that bypassing rectifier diodes is injecting AC on the PSU?
  Reply With Quote
Old 30th October 2004, 10:19 PM   #9
Mark25 is offline Mark25  United Kingdom
diyAudio Member
 
Mark25's Avatar
 
Join Date: Feb 2002
Location: The Netherlands (Friesland)
Quote:
Originally posted by carlosfm
Why do I always have a feeling that bypassing rectifier diodes is injecting AC on the PSU?

i was on the understanding that there's no current flow through a Capacitor, and the bypassing caps have quite high reactance to anything other than rf, so not much of the 50Hz "should" be getting through.
Mark
__________________
We will pay the price, but we will not count the cost...
  Reply With Quote
Old 1st November 2004, 10:20 AM   #10
diyAudio Member
 
Join Date: Mar 2004
Location: Arkansas
Default passing AC

is the AC operating at a higher frequency than the diode?
__________________
Writing is good exercize for the texticles!
  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
Wich 22nf caps to bypass the diodes? samsagaz Power Supplies 0 27th October 2008 11:17 PM
FS: MUR860 Diodes + AD797BR OPAMPS Bartsloty Swap Meet 1 31st October 2005 07:27 AM
Mur860 Diodes discontinued by manufacturer NaftaliG Parts 44 10th October 2004 10:43 PM
WTB: Onsemi or Motorola MUR860 diodes... hoxuanduc Swap Meet 3 5th June 2003 04:29 PM


New To Site? Need Help?

All times are GMT. The time now is 11:30 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