Step down tranformer - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

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 17th October 2005, 12:06 PM   #1
jkeny is offline jkeny  Ireland
Banned
 
Join Date: Feb 2007
Location: Dublin
Default Step down tranformer

Is a step down transformer (250 to 110 volts) out of the question for a 6 100w Panasonic home theatre receiver (digital amp technology - so high effeciency). What size would it have to be to not limit the power of the receiver?

I have a daughter going to New York in Nov and I thought of getting her to pick up a panny SA-XR55 digital amplifier/home theatre receiver to bring home to Ireland - the price difference is substantial 450 euro compared to $250 - almost pay for the flight. The only difference I believe is the power? But I wondered if it would require a huge stepdown transformer? I also thought that there might be an isolation advantage in running off a transformer - keeping mains DC out of receiver?

Has anybody done this sort of thing and what results?

John
  Reply With Quote
Old 17th October 2005, 12:23 PM   #2
jkeny is offline jkeny  Ireland
Banned
 
Join Date: Feb 2007
Location: Dublin
Just another thought - how difficult would it be to modify the Switched Mode Power Supply to deal with 250v from 110v?

I'm surprised more people haven't tried this approach based on the price differential between Ireland & UK verses US (410 euro Irl 250UK $250US).

Mind you the price in Germany is 250euro but another 80euro shipping plus VAT at 21%.

John
  Reply With Quote
Old 18th October 2005, 12:14 AM   #3
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
If it uses a switcher, there may well be a voltage jumper wire inside, or a switch, or it could even be a universal input switcher. Contact Panasonic and ask them. Tell them you are moving and ask if the unit can be switched over. There may be additional small details like safety caps from the mains lines to chassis and similar.

ANy piece of gear should have its mains draw printed on the rear panel. That would be the maximum power the thing pulls from the wall to do its job. A 100 watt output amplifier might need 300 watts from the mains to produce that output power,. Your stepdown transformer would need to provide at least that much. But you don't want to try to power the system with a tranny just barely able to power it, so you need to add an operating margin of at least 50% or preferably more. In my example that means I would need at least a 450 watt transformer and preferably a 600 watt one.
  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
Step-by-step ambitious first project! Suggestions? ledhed2222 Multi-Way 7 13th August 2009 03:51 AM
Step-by-step guide to building a speaker Richy Multi-Way 5 5th August 2008 12:48 AM
stuffing Mileva: first timer step by step questions schro20 Full Range 7 2nd June 2008 05:49 PM
how to make spherical wood horns, step by step angeloitacare Multi-Way 0 29th May 2007 01:50 AM
LM3886 & LM3876 Step-by-step P2P Guides?? zenon Chip Amps 11 18th November 2006 03:16 PM


New To Site? Need Help?

All times are GMT. The time now is 02:11 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