Billu's thread closed - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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
Closed Thread
 
Thread Tools Search this Thread
Old 4th December 2012, 05:52 PM   #1
diyAudio Member
 
Join Date: Jan 2002
Location: nowhere
Default Billu's thread closed

So billu's thread was closed b/c it was an offline smps design. I appreciate the fact that the front end of an offline smps is not isolated from the mains, but the secondary is isolated and fact is these are becoming more and more common. If the secondary wasnt isolated I can agree with closing it due to lethal risks.
An offline smps has more components on the mains side of the transformer and therefore potentially more dangerous, but even our old school transformers have switches, fuses, wiring, line fiilters, etc on the mains side of danger.

Shouldn't offline smps be allowed to be discussed here?
 
Old 4th December 2012, 09:30 PM   #2
diyAudio Member
 
Join Date: Aug 2010
Yes it should.
 
Old 4th December 2012, 09:48 PM   #3
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
SMPS are dangerous to work on. Simply forget to switch it off, grab the pcb and you are dead.

I designed mine to have an LED on to show power was connected. Even then on tests I powered it up from the other end of an extension lead.
I have 30+ years experience in electronics and still managed to blow 3 fuses and blow out the circuit breaker twice !

SMPS are just not worth the risk, stick to linear supplies.
__________________
PCBCAD50 software. http://www.murtonpikesystems.co.uk
 
Old 5th December 2012, 06:17 AM   #4
diyAudio Member
 
Join Date: Jun 2011
Well... Linear transformers do have the primary side also...You can kill yourself with them as well - no difference in that matter between smps and linear...
 
Old 5th December 2012, 06:29 AM   #5
MarianB is offline MarianB  Romania
diyAudio Member
 
MarianB's Avatar
 
Join Date: Jul 2011
Location: Romania
Send a message via Yahoo to MarianB
Quote:
Originally Posted by palstanturhin View Post
Well... Linear transformers do have the primary side also...You can kill yourself with them as well - no difference in that matter between smps and linear...
I do not agree, only a fool leaves the primary side of the linear transformer unisolated, i appologise if that offends anyone but when dealing with lethal voltages you cannot afford any mistakes, that is one of the reasons linear PSU's are much more easyer to built, they are much more safe to one's life. On the other hand ofline SMPS is a real danger to your life if you do not have the experiance to work with them, and that is why i agree fully with the rulle that closes any topik dealing with potentialy unisolated ofline SMPS, there are many solutions to isolate it properly so nothing can excuse the lack of it.
__________________
Trance Session Live by Dj Marik
 
Old 5th December 2012, 06:34 AM   #6
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
unless you can show that you are in fact using mains isolation transformers, then these types of threads will not be allowed.....remember, death is permanent....
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
 
Old 5th December 2012, 06:36 AM   #7
freax is online now freax  Australia
diyAudio Member
 
freax's Avatar
 
Join Date: Sep 2007
Location: NSW
yikes, yes please censor this.

smps are not to be messed with and brung into the diy world, especially ones with components on the primary side. stick to linears for diy.
__________________
"It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away" - Antoine de Saint Exupéry

Last edited by freax; 5th December 2012 at 06:42 AM.
 
Old 5th December 2012, 06:47 AM   #8
diyAudio Member
 
Join Date: Jan 2011
Location: Fosser, Aurskog-Holand, Akershus, Norway.
Security above all folks.

And we should not attempt to "overrule" this in any way.
__________________
Sooner or later you end up with TANDBERG
 
Old 5th December 2012, 07:07 AM   #9
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by SemperFi View Post
So billu's thread was closed b/c it was an offline smps design. I appreciate the fact that the front end of an offline smps is not isolated from the mains, but the secondary is isolated and fact is these are becoming more and more common. If the secondary wasnt isolated I can agree with closing it due to lethal risks. An offline smps has more components on the mains side of the transformer and therefore potentially more dangerous, but even our old school transformers have switches, fuses, wiring, line fiilters, etc on the mains side of danger. Shouldn't offline smps be allowed to be discussed here?
The "secondary" output that would go to the amp wasn't what was being discussed in that thread. You were fitting and annihilating primary silicon.

There is a world of difference between wiring a conventional off the shelf transformer to the mains and attempting to build/design/modify a high frequency switching power supply that has all the primary electronics live.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
 

Closed Thread


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
Should a person who starts a thread have quasi moderator status on their own thread? erin The Lounge 15 23rd October 2012 10:41 PM
Closed sub box Tenson Subwoofers 12 27th June 2006 05:53 PM


New To Site? Need Help?

All times are GMT. The time now is 12:39 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