Back to Back transformers and safety ground - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 9th February 2009, 06:38 PM   #1
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Default Back to Back transformers and safety ground

I was thinking of using a 120:12VAC wall wart transformer for a project, powering the heaters from the 12V, and using a small 12:240 transformer inside the chassis for B+. Problem is that the wall wart only has two wires, so there is no connection to safety ground. This will probably be connected to a more conventionally wired source, so it may have a safety ground connection that can be piggybacked from, but I am not sure about it. Any suggestion on a safe way to do this, or is it just a bad idea?
  Reply With Quote
Old 9th February 2009, 10:10 PM   #2
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
Default Re: Back to Back transformers and safety ground

Quote:
Originally posted by dsavitsk
I was thinking of using a 120:12VAC wall wart transformer for a project, powering the heaters from the 12V, and using a small 12:240 transformer inside the chassis for B+. Any suggestion on a safe way to do this, or is it just a bad idea?
I don't think it's a 'bad" idea. If you leave it encapsulated in it's plastic housing, then it's isolated from your touch and the chassis. If you open it up to use the bare transformer, then be sure the core makes a good physical ground connection to the chassis which will/should have a safety ground. I might be a little more concerned with any possible hum problems.

Victor
__________________
"It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong." ~Thomas Sowell
  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
Back to Back transformers dsavitsk Tubes / Valves 5 20th August 2009 11:53 PM
Back to back transformers. leadbelly Tubes / Valves 2 5th March 2009 05:55 PM
back to back isolation transformers: maxlorenz Parts 30 27th March 2006 03:15 AM
Back to Back transformers as Isolation transformers mikee55 Chip Amps 2 17th March 2006 11:38 AM
Back to Back transformers to get +B of 200V ?? Shoog Tubes / Valves 5 23rd September 2005 03:58 AM


New To Site? Need Help?

All times are GMT. The time now is 12:58 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