Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Powersuply mystery
Powersuply mystery
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 10th May 2004, 08:09 AM   #1
argo is offline argo  Estonia
diyAudio Member
 
Join Date: Feb 2001
Location: Estonia
Default Powersuply mystery

I have one trafo with two secondary windings feeding four rectifier bridges for two symmetrical regulated powersupplies like shown in sketch below. Something is wrong with this circuit because it trips the main fuses of any value. I also tried bare wire soldered across the fuse for a second (WARING- donít try that at home) and seems like thereís a short circuit somewhere because tranny and bridges got really hot during that. Only thing I can figure out is maybe short in the capacitors. But the caps were fine before applying power. So I am clueless. Can somebody figure out what is wrong here?



Thanks in advance

Argo
Attached Images
File Type: png psu.png (2.5 KB, 175 views)
  Reply With Quote
Old 10th May 2004, 08:23 AM   #2
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Default Re: Powersuply mystery

Quote:
Originally posted by argo
......Can somebody figure out what is wrong here?....
Hi,
secondaries are shortened with two serial two antiparallel diodes thru ground.
Two bridges for same supply must be supply from same secondary. For example, B1 and B3 from S2, and B2 and B4 from S1.

Regards
  Reply With Quote
Old 10th May 2004, 09:00 AM   #3
argo is offline argo  Estonia
diyAudio Member
 
Join Date: Feb 2001
Location: Estonia
Oh yeah, I must have been blind I just draw the sketch only after I wired the circuit. I wired it like this because it was more convenient (shorter wires, less mess). Very stupid of me .
I should have drawn the circuit before wiring and give a second or two of thought rather than second or two of shortened secondaries .
Thanks a bunch for pointing out this error

Argo
  Reply With Quote
Old 10th May 2004, 11:03 AM   #4
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Hi,

Also, this PS setup isn't optimal, IMHO.
A better setup is with CT secondary and single bridge for each +/- PS.

Regards
  Reply With Quote
Old 10th May 2004, 12:05 PM   #5
argo is offline argo  Estonia
diyAudio Member
 
Join Date: Feb 2001
Location: Estonia
Why this setup isn not optimal?
I wold agree two trannys instead one would be much better. This is my final goal but did'nt had two of them at hand so I tried with one at first.
  Reply With Quote
Old 10th May 2004, 12:22 PM   #6
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Quote:
Originally posted by argo
Why this setup isn not optimal?
Hi,

draw bridges like 4 diodes. Than you will find that you have parallel diodes pairs from different bridges thru the ground point. If those diodes haven't perfectly same V-I characteristic some current will flow thru ground connections from first to second PS and vice versa. This isn't good.

Regards
  Reply With Quote
Old 10th May 2004, 01:46 PM   #7
argo is offline argo  Estonia
diyAudio Member
 
Join Date: Feb 2001
Location: Estonia
Quote:
Originally posted by moamps

Hi,

draw bridges like 4 diodes. Than you will find that you have parallel diodes pairs from different bridges thru the ground point. If those diodes haven't perfectly same V-I characteristic some current will flow thru ground connections from first to second PS and vice versa. This isn't good.

Regards

I see . Good point
Thanks.

Argo
  Reply to this post

Reply


Powersuply mysteryHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
little 6.5 mystery ... oface Full Range 6 4th November 2007 11:20 PM
Powersuply Le Bong? HDaudio Tubes / Valves 11 14th February 2007 11:10 PM
2 trannies on one powersuply Per Solid State 15 10th October 2002 06:42 AM


New To Site? Need Help?

All times are GMT. The time now is 09:36 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki