Bridge Rectifier question - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 14th January 2006, 02:51 AM   #1
hotscot is offline hotscot  Scotland
diyAudio Member
 
Join Date: Aug 2004
Location: California
Default Bridge Rectifier question

The Bridge Rectifier in the power supply of my Marantz amp is physically damaged. It's a square shaped part from Shindengen, 200V, 4 amp.

Could someone with more knowledge than me tell me if I have to replace it with the exact same value? I see for example that Radio Shack have a 200V 6 amp rectifier. I just want to put something in the circuit to see if it will work.

Regards
Alan
  Reply With Quote
Old 14th January 2006, 02:54 AM   #2
poobah is offline poobah  United States
diyAudio Member
 
poobah's Avatar
 
Join Date: Nov 2005
You're fine, and thinking correctly.

You do have to ask yourself though... why did the rectifier blow? You might want to probe around on the rails and look for more shorts/failed comps...

  Reply With Quote
Old 14th January 2006, 03:02 AM   #3
hotscot is offline hotscot  Scotland
diyAudio Member
 
Join Date: Aug 2004
Location: California
Default Probably my fault

Well...I'm embarrassed to say that at one time I took the two large caps out of the board and then replaced them..don't ask...and at that time I knew nothing about polarisation. So if I had them in the wrong way could that have damaged the rectifier?
I'm taking baby steps here

Schematic attached.

Regards
Alan
Attached Images
File Type: jpg damagedbridgerectifier.jpg (54.4 KB, 233 views)
  Reply With Quote
Old 14th January 2006, 03:04 AM   #4
diyAudio Member
 
Join Date: Sep 2002
Location: Sweden
Did you replace the caps with larger ones (ie. more uF)? In that case you get higher charge currents and may need a bridge with higher rating.
  Reply With Quote
Old 14th January 2006, 03:05 AM   #5
hotscot is offline hotscot  Scotland
diyAudio Member
 
Join Date: Aug 2004
Location: California
Default In fact...

If I'm going to stay bitten by this bug are there any straightforward guides on how to test individual components. I understand I'd need a meter.

Alan
  Reply With Quote
Old 14th January 2006, 03:08 AM   #6
poobah is offline poobah  United States
diyAudio Member
 
poobah's Avatar
 
Join Date: Nov 2005
Well,

I won't ask then... you are on the right track. I know the bigger caps opened up your soundstage and gave you fast bass.............................................. .................................................. ...........................
  Reply With Quote
Old 14th January 2006, 03:09 AM   #7
poobah is offline poobah  United States
diyAudio Member
 
poobah's Avatar
 
Join Date: Nov 2005
Fess up,

Tell us what you did to the caps...
  Reply With Quote
Old 14th January 2006, 04:01 AM   #8
hotscot is offline hotscot  Scotland
diyAudio Member
 
Join Date: Aug 2004
Location: California
Default Different values

Good question...


I replaced 12000uF 56 V caps with 10000 63 V Caps.

Should I adjust the Bridge Rectifier..I was going to use a 200V 6 Amp from RadioShack.
  Reply With Quote
Old 14th January 2006, 04:03 AM   #9
hotscot is offline hotscot  Scotland
diyAudio Member
 
Join Date: Aug 2004
Location: California
Default See reply a few posts back..

About how I messed up. I'm not an electronics person..this is all new to me...but with all your help I'm learning fast
And I'm grateful.
  Reply With Quote
Old 14th January 2006, 04:06 AM   #10
diyAudio Member
 
Join Date: Sep 2002
Location: Sweden
Well, since you replaced with smaller caps, that is probably not the reason, although it could be if they are better (lower ESR) and the bridge was designed on the limit. However, that is probably not the cause of the fault in this case.
  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 voltage question woody Power Supplies 1 1st May 2008 12:47 AM
bridge rectifier question crippledchicken Power Supplies 31 25th April 2008 11:17 AM
Bridge Rectifier Question sam9 Solid State 3 16th October 2004 01:03 AM
Simple bridge rectifier question. JoeBob Everything Else 51 15th February 2002 07:46 PM


New To Site? Need Help?

All times are GMT. The time now is 12:12 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