2 toroids in monoblock? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 3rd February 2013, 04:53 AM   #1
markre is offline markre  Finland
diyAudio Member
 
Join Date: Jan 2012
Default 2 toroids in monoblock?

I opened my old Goldmund srm monoblocks and found 2 toroid (same size) transformers inside. Can anybody tell me what the idea behind this design is?
  Reply With Quote
Old 3rd February 2013, 05:37 AM   #2
diyAudio Member
 
Join Date: Jul 2012
Location: Wichita, KS
It most likely has two power rails: a power supply with a positive and negative half that are at the same voltage from ground (ig +30V and -30V). This is often done with two separate windings on the same transformer, but for availability or other reasons they went with two transformers. (perhaps two were cheaper than one special made one)
  Reply With Quote
Old 3rd February 2013, 07:55 AM   #3
diyAudio Member
 
Join Date: Mar 2008
No, it has not two power rails. The srm monoblock has only one rectiflier.
The transformers are connected in parallel. If this really helps this amp is debatable.
From what I understand they only buy one size of toroidal transformers used in most of there amplifier products.
  Reply With Quote
Old 3rd February 2013, 09:01 AM   #4
oz7aff is offline oz7aff  Denmark
diyAudio Member
 
oz7aff's Avatar
 
Join Date: May 2012
Location: Denmark
No, it has 4 rectifiers, so dual power rail is no problem
__________________
Regards Max
  Reply With Quote
Old 3rd February 2013, 09:24 AM   #5
diyAudio Member
 
Join Date: Mar 2008
In these pictures of the srm monoblock here are only one rectiflier.
Attached Images
File Type: jpg SRM mono.jpg (123.7 KB, 215 views)
File Type: jpg srm mono-2.jpg (169.8 KB, 214 views)
  Reply With Quote
Old 3rd February 2013, 09:30 AM   #6
oz7aff is offline oz7aff  Denmark
diyAudio Member
 
oz7aff's Avatar
 
Join Date: May 2012
Location: Denmark
It is a bridge rectifier, and there is 4 rectifiers inside.
__________________
Regards Max
  Reply With Quote
Old 3rd February 2013, 10:04 AM   #7
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Let's be clear, there are 4 diodes in a bridge rectifier. That doesn't mean it handles any more than one supply of balanced, +/- rails. If there are 2 rail voltages, there need to be 2 bridge rectifiers. That's a total of 8 diodes.

In the R/H pic, the windings from each transformer are paralleled at the PCB connection, so 1 trafo supplies one rail, the second supplies the other.

Anyone like to suggest how else it could be wired with effectively only one winding from each trafo?
__________________
regards
  Reply With Quote
Old 3rd February 2013, 10:27 AM   #8
oz7aff is offline oz7aff  Denmark
diyAudio Member
 
oz7aff's Avatar
 
Join Date: May 2012
Location: Denmark
You can wire a +/- supply with only 2 diodes with the disavantage that the ripple will be 50 Hz and there will be a demand for bigger filtercapacitors.

And making +/- supply with only one bridge rectifier is no problem, you can use 2 bridges, but that only ad noise and power loss to the system.

Click the image to open in full size.
__________________
Regards Max
  Reply With Quote
Old 3rd February 2013, 10:34 AM   #9
Elias is offline Elias  Finland
diyAudio Member
 
Elias's Avatar
 
Join Date: May 2003
Location: Where you live
Quote:
Originally Posted by markre View Post
Can anybody tell me what the idea behind this design is?
To balance the weight evenly accross the enclosure, to make it feel more 'hifi' ?


But only 1000uF filter caps ??
__________________
Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets
  Reply With Quote
Old 3rd February 2013, 10:53 AM   #10
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Quote:
You can wire a +/- supply with only 2 diodes with the disavantage that the ripple will be 50 Hz and there will be a demand for bigger filtercapacitors......And making +/- supply with only one bridge rectifier is no problem, you can use 2 bridges, but that only ad noise and power
Quite so, those are possible rectifier arrangements for dual winding transformers.

However, neither follow the wiring of the posted image, where there is, effectively, only 1 secondary winding in each trafo, because each pair of leads from each trafo is simply paralleled before rectification.
ergo: It cannot be either A or B circuits.
__________________
regards

Last edited by Ian Finch; 3rd February 2013 at 10:56 AM.
  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
Yet another monoblock Sch3mat1c Solid State 4 22nd August 2009 12:00 AM
Monoblock Gainclones Peter Menting Swap Meet 4 21st September 2007 11:24 AM
monoblock vs. one chassis? Magnetmaz Tubes / Valves 49 17th June 2005 05:42 AM
My first Aleph 4 Monoblock :-) Smithers Pass Labs 14 19th January 2004 01:12 PM
a 71A monoblock Joel Tubes / Valves 30 30th December 2002 09:19 PM


New To Site? Need Help?

All times are GMT. The time now is 10:19 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