Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Mounting toroidal transformers without proper monuting kit
Mounting toroidal transformers without proper monuting kit
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 14th March 2014, 08:21 PM   #1
Greg Erskine is offline Greg Erskine  Australia
diyAudio Member
 
Greg Erskine's Avatar
 
Join Date: Jan 2002
Location: Sydney/Australia
Mounting toroidal transformers without proper monuting kit
Default Mounting toroidal transformers without proper monuting kit

Hi all,

Are I becoming even more paranoid?

I notice people are starting to mount toroidal transformers directly on metal mounting plates/chassis without using the proper mounting kit. I am concerned that the insulation will wear through resulting in a short to the chassis.

Is this a safety issue?

regards
__________________
Greg Erskine

Last edited by Greg Erskine; 14th March 2014 at 09:22 PM.
  Reply With Quote
Old 14th March 2014, 08:26 PM   #2
KatieandDad is offline KatieandDad  United Kingdom
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
It's a wise idea to use neoprene washers to prevent damage to the windings. If the centre of the transformer is potted then you can get away without using them. The washers are only there to protect the windings.
  Reply With Quote
Old 14th March 2014, 08:43 PM   #3
osscar is offline osscar  Latvia
diyAudio Member
 
osscar's Avatar
 
Join Date: May 2009
Location: Riga, LV
I think that the rubber washer helps to reduce vibration also, if any.

sink assembly parts can also be useful in this case
Attached Images
File Type: jpg santehnika-a33.jpg (155.5 KB, 193 views)
__________________
My DIY so far: two Leach amps, Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, Whammy headphone amp.
  Reply With Quote
Old 14th March 2014, 08:52 PM   #4
dchisholm is offline dchisholm  United States
diyAudio Member
 
dchisholm's Avatar
 
Join Date: Mar 2011
Location: St Louis, Mo
Related thread:
Fasteners for transformers?

Dale
  Reply With Quote
Old 14th March 2014, 08:58 PM   #5
Greg Erskine is offline Greg Erskine  Australia
diyAudio Member
 
Greg Erskine's Avatar
 
Join Date: Jan 2002
Location: Sydney/Australia
Mounting toroidal transformers without proper monuting kit
Quote:
Originally Posted by KatieandDad View Post
It's a wise idea to use neoprene washers to prevent damage to the windings. If the centre of the transformer is potted then you can get away without using them. The washers are only there to protect the windings.
Hi KatieandDad,

Thanks. Personally I always use the neoprene washers, but I am beginning to see people mounting unpotted toroids directly onto metal surfaces. I always cringe but say nothing.

I have noticed that cheap toroids are often supplied without the appropriate mounting kit. These cheap toroids also can have untidy windings that results in a couple of windings becoming the pressure point on the metal mounting surface.

I consider this a major safety issue. What do other's think?

I just want to raise this as a "potential" issue.

regards
__________________
Greg Erskine
  Reply With Quote
Old 14th March 2014, 09:07 PM   #6
Greg Erskine is offline Greg Erskine  Australia
diyAudio Member
 
Greg Erskine's Avatar
 
Join Date: Jan 2002
Location: Sydney/Australia
Mounting toroidal transformers without proper monuting kit
Quote:
Originally Posted by dchisholm View Post
Related thread:
Fasteners for transformers?

Dale
Thanks Dale,

Yeah, we always point out the shorted turn issue but I have never seen anyone point out mounting directly on a metal surface without a neoprene washer as being a safety issue.

I have been wondering if I was been "overly" concerned as even our safety experts have not raised the issue (well, I have noticed any warnings).

regards
__________________
Greg Erskine
  Reply With Quote
Old 19th March 2014, 12:32 AM   #7
Mark Johnson is offline Mark Johnson  United States
diyAudio Member
 
Mark Johnson's Avatar
 
Join Date: May 2011
Location: Silicon Valley
Mounting toroidal transformers without proper monuting kit
Squeeze a pecan sized blob of silicone bathtub caulk onto the mounting surface and spread it out into a circle whose diameter is 1cm larger than the diameter of the toroid. Let it dry 24 hours. How thick is it? How springy is it? If you're worried it's insufficient, apply a second coat and let dry another 24 hours. Now your toroidal transformer rests on a pliable, vibration-absorbing cushion of silicone.
  Reply With Quote
Old 19th March 2014, 02:39 AM   #8
dchisholm is offline dchisholm  United States
diyAudio Member
 
dchisholm's Avatar
 
Join Date: Mar 2011
Location: St Louis, Mo
Quote:
Originally Posted by Mark Johnson View Post
Squeeze a pecan sized blob of silicone bathtub caulk . . . .
Silastic, like solder and cyanoacrylate adhesive and AWG26 insulated wire, is one of the items found on any electronics workbench worthy of the title. I've used it liberally to improve the mechanical integrity of comparatively large components (e.g., capacitors) mounted on a printed wiring board. Using it as a mounting cushion under a toroidal power transformer is a great idea. It may take a little effort to give it a neat and tidy visual appearance but even a sloppy job will perform the functions we're concerned with here.

Other DIY approaches to creating a mounting washer include:
  • Cutting a circular washer from a piece of neoprene gasket sheeting, purchased at the auto parts store
  • The circular plastic lids found on cans of coffee, salted nuts, margarine, shortening, etc, at the grocery store
  • Circles cut from scrap pieces of short-nap indoor/outdoor carpet (the kind with flexible plastic, rather than foam, backing)
Dale
  Reply With Quote
Old 19th March 2014, 03:28 AM   #9
Bibio is offline Bibio  Scotland
diyAudio Member
 
Bibio's Avatar
 
Join Date: Mar 2009
old cd's and cut up camping mats.
  Reply With Quote
Old 19th March 2014, 01:19 PM   #10
HeliMan is offline HeliMan  United Kingdom
diyAudio Member
 
HeliMan's Avatar
 
Join Date: Sep 2013
Location: Somerset, UK
Do it properly.. or you'll only do it once!
__________________
"I used to be with it, but then they changed what it was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you too!" Grandpa Simpson.
  Reply With Quote

Reply


Mounting toroidal transformers without proper monuting kitHide 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
Proper mounting of TO-247 Devices Mark A. Gulbrandsen Pass Labs 20 10th April 2017 07:53 PM
Toroidal Transformers, Tubes, TVR 6V6 Variable Tube Voltage Regulator Kit (180-450V & geraldgerald Swap Meet 9 14th September 2012 06:55 AM
Toroidal transformers mounting akis Power Supplies 6 24th August 2009 03:35 PM
toroidal transformer mounting kit digitalabyss Parts 0 30th April 2009 09:45 PM
Proper Mounting Large Caps rolandong Parts 18 18th July 2007 09:52 AM


New To Site? Need Help?

All times are GMT. The time now is 05:19 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki