Bridge rectifier power source - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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
Thread Tools Search this Thread
Old 21st December 2010, 02:44 AM   #1
diyAudio Member
Join Date: Dec 2010
Default Bridge rectifier power source

I am having problems with a bridge rectifier power source I built. I have traced the problem to the rectifier diode I am using. My voltage going into the diode is ~25 VAC. My voltage coming out as DC should be the same, one positive and one negative, correct? My multimeter is reading negative ~29 V DC and positive ~6 V DC. The diode was spec'ed as 8 amp and 400V tolerances. Is there a possibility that there is something wrong with my circuit (I don't think so), or is this just a diode that is messed up?

  Reply With Quote
Old 21st December 2010, 06:31 AM   #2
diyAudio Member
Join Date: Mar 2010
I think the problem is in your measurement. You measure 29 and 6 Volts with respect to what? A bridge rectifier has only two output wires and you measure between them.
  Reply With Quote
Old 21st December 2010, 07:06 AM   #3
diyAudio Member
aardvarkash10's Avatar
Join Date: Mar 2007
Location: Auckland, NZ
(25 x 1.414) - rectifier losses = 35-ish (or, 29 + 6)

Well done Sherlock!
"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile,
  Reply With Quote
Old 21st December 2010, 07:19 AM   #4
diyAudio Member
Join Date: Dec 2010
Measuring across from the positive lead to the negative lead gives me ~37 V.

My drawing says coming out of the diode should be +22V and -22V but I am using a different transformer, therefore my numbers are higher. Shouldn't my positive and negatives be equal though?
  Reply With Quote
Old 21st December 2010, 02:37 PM   #5
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Is the centre-tap of the transformer grounded? Does it have a centre-tap? If not, you are in effect measuring via the leakage resistance of the transformer (or something).
  Reply With Quote


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
Location of rectifier bridge? ex192 Chip Amps 3 8th May 2005 03:40 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
Bridge Rectifier Temperature? Eric Pass Labs 3 3rd June 2003 02:43 AM

New To Site? Need Help?

All times are GMT. The time now is 04:46 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2