Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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.

R-Core vs Toroid
R-Core vs Toroid
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 3rd October 2004, 09:09 PM   #1
Bizarroterl is offline Bizarroterl  United States
diyAudio Member
Join Date: Sep 2004
Location: SJ, CA
Default R-Core vs Toroid

I've been doing some reading on transformers for an amplifier power supply. I've read conflicting information that each has less leakage than the other. What are the advantages of one over the other?
  Reply With Quote
Old 4th October 2004, 09:00 AM   #2
AX816 is offline AX816  Romania
diyAudio Member
Join Date: Sep 2004
Location: Timisoara
Send a message via MSN to AX816 Send a message via Yahoo to AX816
Again this is a matter of taste in some aspects....as u may find on course is that the R core is more of a new fashioned transformer amazing only ...in my view of course only by the hi packaging capability an so by the hi current capability ...and in conclusion high efficiency per wheight.To that u may add if the ergonomics matter more to you than the sound ,the low profile and as other say good looking...bleah.


For me the king still is the all mighty torroidal...big sometimes pretty hard to manufacture but the results are no to be matched...low noise ...low overall magnetical loss and depending on the power that must be obtained up to 95% efficiency.
Overall transformer design is quite a complicated science ...coz there are many aspects to care about....overall power range and time usage for the stable current flow where thermicity is a real pain in the *** ...type of isolation used.The japs use preventive measures in many of their audio products...exept Accuphase...Nakamiki ..and some other really high end manufacturers. I use almost all the time torroidal based PSU wich i manufacture ....and i can say that the results exceeded my expectations.If interrested in the overall calulus....i may privide u with some interresting facts.

  Reply With Quote
Old 6th October 2004, 07:22 AM   #3
jcarr is offline jcarr  United States
diyAudio Member
Join Date: Jul 2002
Location: Tokyo, Japan
Toroidal transformers have good regulation and low output impedance, but OTOH high interwinding capacitance. High interwinding capacitance means wide bandwidth coupling between the primary and secondary windings. This may not be what you want in an audio power supply, as it implies that all kinds of noise as well as 50/60Hz can pass through the power supply. If you decide to use a toroidal transformer, I would specify an additional electrostatic shield between the primary & secondary windings, as this helps reduce the primary-secondary noise transmission issue somewhat.

EI (frame) core, C-core and R-core transformers usually have split-bobbin primary and secondary windings, which cuts down on interwinding capacitance and makes it considerably more difficult for non-50/60Hz noise components to pass in and out of the power supply. Here you can also specify an additional electrostatic shield between the primary & secondary windings for less noise transmission, but this is not as important as it is when using a toroidal transformer for power supply applications. OTOH, EI, C and R-cores are usually physically larger and heavier for a given VA rating (at a given flux) than a toroidal, and this can have a direct impact on the size and weight of the amplifier chassis.

At the end of the day, it is possible to make a good-performing and good-sounding power supply using toroidal, EI, C-core or R-core transformers. But the cost and implementation issues will differ if you are trying to make any sort of optimized design.

hth, jonathan carr
http://www.lyraconnoisseur.com/, http://www.lyraaudio.com
  Reply With Quote


R-Core vs ToroidHide 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
AIR-Core Vs Ferrite-Core Inductor in Class-D amplifiers Workhorse Solid State 14 4th April 2016 01:26 PM
inductor/choke/air core/ferrite core. . . same thing? poolorpond Pass Labs 24 29th March 2008 10:55 PM
Toroid or EE Ferrite core, which is Best for 240V mains SMPS Workhorse Power Supplies 49 6th February 2007 06:44 PM
Solen Air core inductors, Hammond Iron core. gnomus Swap Meet 0 30th July 2004 01:28 AM
Any website reference for diy choke ,siliver R-core, C-core, EI and power transformer bmpa Parts 2 22nd April 2004 04:15 AM

New To Site? Need Help?

All times are GMT. The time now is 08:06 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio