New Snubber Board v.3 - Up in smoke - 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 14th May 2005, 05:02 AM   #1
needlz is offline needlz  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Bay Area, CA
Default New Snubber Board v.3 - Up in smoke

Hey All,

I have a single transformer wired to a single snubber board to run the amp boards in stereo. I checked the voltage on the secondaries before wiring them to the snubber and all was good... when I sent the juice to the populated snubber board, the bleeder resistors (r3, r4) went up in a blaze of glory. Do I need to do anything else before sending juice to it? I wanted to check the pg+/v+ & pg-/v- outputs before wiring it to the amp boards.

thanks.
  Reply With Quote
Old 14th May 2005, 05:06 PM   #2
homer09 is offline homer09  Canada
diyAudio Member
 
homer09's Avatar
 
Join Date: Jan 2004
Location: Montreal
are your caps on the right way? how about your diodes?

check everything and compare your populated board to pics of Brian's in his gallery. probably a little mistake somewhere.
__________________
Most people wouldn't know good music if it came up and bit them in the ***. - Frank Zappa
  Reply With Quote
Old 14th May 2005, 06:23 PM   #3
needlz is offline needlz  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Bay Area, CA
Yeah... the board is fine. Only the bleeder resistors were effected.
  Reply With Quote
Old 14th May 2005, 07:06 PM   #4
needlz is offline needlz  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Bay Area, CA
Do pg+/v+ & pg-/v- need to be connected to anything before I send juice to the AC1/AC2 side? I just went through the board and everything is fine. No idea why the bleeders are blowing out.
  Reply With Quote
Old 14th May 2005, 07:50 PM   #5
Jean is offline Jean  United States
diyAudio Member
 
Jean's Avatar
 
Join Date: Mar 2002
Location: Sacramento, CA
Send a message via AIM to Jean
Maybe your bleeder resistors are wrong values, so there is too much current going through them ?
__________________
left lane is for passing, slower traffic keep right please.
  Reply With Quote
Old 14th May 2005, 08:04 PM   #6
loong is offline loong  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Earth
Quote:
Originally posted by Jean
Maybe your bleeder resistors are wrong values, so there is too much current going through them ?
My 2.2K 2W with 12,000UF cap works fine. My friend's system use 10K 5W with 40,000UF cap and it works fine too. Just wonder how to compute the valid rang of valid? Any advice? Thanks.
  Reply With Quote
Old 14th May 2005, 09:31 PM   #7
needlz is offline needlz  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Bay Area, CA
Hot d*mn... that's it. I was using a 2.2ohm instead of a 2.2K ohm for the bleeders. My eyes are getting bad. Would this cause the fireshow?
  Reply With Quote
Old 14th May 2005, 09:51 PM   #8
homer09 is offline homer09  Canada
diyAudio Member
 
homer09's Avatar
 
Join Date: Jan 2004
Location: Montreal
uhmmmmm YES

you had 1000x more current flowing through the resistors and they have the same 2W rating....
__________________
Most people wouldn't know good music if it came up and bit them in the ***. - Frank Zappa
  Reply With Quote
Old 14th May 2005, 10:48 PM   #9
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Quote:
Originally posted by needlz
Hot d*mn... that's it. I was using a 2.2ohm instead of a 2.2K ohm for the bleeders. My eyes are getting bad. Would this cause the fireshow?
Of course, that's practically a short.
  Reply With Quote
Old 15th May 2005, 05:46 AM   #10
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Quote:
Originally posted by needlz
Hot d*mn... that's it. I was using a 2.2ohm instead of a 2.2K ohm for the bleeders.
I can't tell you how many times I have ordered the wrong resistors -- either adding or omitting a K. Oddly, this never happens at DigiKey and nearly always happens at Mouser. Fortunately I have never gone so far as to actually solder them down. I do wish, however, that people would use the "R" notation, i.e., 2.2Rohm as this would help me tremendously. It is hard to see that K in there and the presence of the R would force me to look for something. Maybe an R looks enough like a K that I'd screw it up anyway.

-d
  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
Zen V4 smoke.... rebojorge Pass Labs 8 20th December 2007 08:34 PM
T-amp up in smoke jwb009 Class D 21 4th April 2006 06:50 AM
I let the smoke out. TerryG Class D 16 8th November 2005 06:25 PM
adding caps and snubber network to LM3875 power board quickshift Power Supplies 0 19th August 2005 02:12 PM
Up in smoke... PhaseShift Solid State 2 3rd September 2002 05:03 PM


New To Site? Need Help?

All times are GMT. The time now is 02:16 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