bridging amplifier with input transformers - 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 7th June 2012, 05:26 PM   #1
diyAudio Member
 
Join Date: Jul 2010
Default bridging amplifier with input transformers

Hi,


I have 2 , YAMAHA B-5 POWER AMPS, each rated at 200W/Ch into 8 ohm, my aim is to bridge to make them monoblocks for 8 ohm speakers.

The objective is to get better CMMR and not higher output power , so i want to use an output transformer 2:1 step down , any idea how to implement it?

Is step down ratio correct ?
Should i use split input transformer?
How to implement it to get better sound quality , like the one implemented by McIntosh.

Regards
  Reply With Quote
Old 7th June 2012, 06:30 PM   #2
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
A transformer for high quality for this power will be a monster. Definitively not needed.
__________________
LW1DSE
  Reply With Quote
Old 7th June 2012, 06:36 PM   #3
diyAudio Member
 
Join Date: Jul 2010
what about input transformer? any implementations link/sugggestion ?
  Reply With Quote
Old 7th June 2012, 06:42 PM   #4
diyAudio Member
 
Join Date: Jul 2010
and BTW i wanted to implement OPT to increase load impedance as 8 ohm would be 4 ohm in bridge and i donot want to push high currents through the amp.
I will be fine with lesser available power but greater SQ and damping factor?
  Reply With Quote
Old 7th June 2012, 07:03 PM   #5
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
It is unnecessary. Simply reduce input signal. And a inverter can be done with a single transistor and few resistors, or a opamp. There are lots of circuits that don´t need a transformer. The Xformer is a source of lots of problems, so though the time has been searched forms to avoid it.
__________________
LW1DSE
  Reply With Quote
Old 7th June 2012, 11:44 PM   #6
diyAudio Member
 
Join Date: Oct 2009
Location: Hamburg
Using a transformer can safely isolate the electrical input.

I wonder if a transformer on the input might remove some noise from a computer power supply? Im looking at building some balanced inputs, and playing.

This is more a subject for line level pre-amps though.
  Reply With Quote
Old 8th June 2012, 12:04 PM   #7
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Quote:
Originally Posted by owenhamburg View Post
Using a transformer can safely isolate the electrical input.

I wonder if a transformer on the input might remove some noise from a computer power supply? Im looking at building some balanced inputs, and playing.

This is more a subject for line level pre-amps though.
It may be done more easily with a photocoupler, and getting ouput from emmiter for one channel, and from collector to the other, lower cost, lower space, lower hum, lower....
__________________
LW1DSE
  Reply With Quote
Old 8th June 2012, 01:17 PM   #8
diyAudio Member
 
Join Date: Jul 2010
here is the issue, a P-2 Statement Anthem amplifier is aroung 2500 USD, i have 2 Yamaha B5 amplifier, built like tank, even the screws are made of copper, which is 200 W/pc into 8 ohm so i wanted to make a 400 W/pc monoblocks into 8 ohm so as no to push the current limits of an old ampliifer , since the 8 ohm in bridged would be 4 ohm for which there is no rating mentioned for amplifier i need to increase the load impedance at least to 8 ohm to get around 400W monoblocks which are way cheaper i.e. 300 USD/piece (my purchase ) , better SNR. better CMMR and hopefully better SQ ???? any suggestions,

BTW the heat sinks on Statement Anthem P2 indicates a very low bias current for power output of 350 Wpc , which means lower B region amplification, whereas the generous heat sinks of yamaha means higher bias and more towards class AB amplification ??


any ideas ?
  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
Ampex Vintage 4580200-01 Bridging Input Transformer Clomifuge Vendor's Bazaar 0 8th May 2011 03:45 PM
Lame Amp Question - X'ing, Balanced Input, same as Bridging? john65b Pass Labs 1 30th October 2010 12:27 PM
WTB: mic bridging transformers mobyd Swap Meet 0 6th January 2010 09:21 AM
Input transformers and IC input impedances duffy Chip Amps 4 2nd December 2004 06:08 AM
bridging an LM4881 headphohne amplifier? Can it be done? soundNERD Chip Amps 6 1st April 2004 01:28 AM


New To Site? Need Help?

All times are GMT. The time now is 03:26 PM.


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