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Old 17th May 2004, 05:20 PM   #1
troystg is offline troystg  United States
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Default Securing Torids

Hi All-

I have bought some transformers from of Steve @ Apex.jr and am looking for the best method of mounting.

I see most torids have the "hubcap" plate to pinch the torid to the chassis but I was hoping to hear of other possibilities.

In my Jeff Rowland model 2 the two transformers are in a steel or lead tube and that is mounted to the chassis.

http://www.jeffrowland.com/m2pix.htm

By the way, my gainclone(brianGT's boards) is to look similar to my model 2.


I was thinking of putting the two torids in a box potted with epoxy? Then mount the box to the chassis.

Anyone do something like that? Or have pictures of "creative" mounting solutions?

Thanks in advance,

Troy

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edit 2 chassis design comment
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Old 17th May 2004, 09:35 PM   #2
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I don't think I'd suggest potting a toroidal transformer, as they will need to dissipate some heat while operating, especially at or near their rated output power limit.

That said, one trick I've seen employed is to mount the toroid via 3 to 6 straps or tiewraps looped through square tiewrap mounting pads. This has the advantages of flexing and not rattling and not reacting to the magnetic fields in and around the toroid core, but has the disadvantage of requiring more than just the two-sided foam tape the mounting pad come with.

oO
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Old 18th May 2004, 04:45 PM   #3
troystg is offline troystg  United States
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Default Bump, nobody's original?

So no-one has done anything unique for pwr supplies?
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Old 21st May 2004, 03:35 AM   #4
jhead is offline jhead  United States
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If you notice on the Plitron transformers they epoxy the center and then drill a hole thru the epoxy go to the peter danials thread on the gainclone chassis group buy and take a close look at the plitron transfomer mounting I think this is one of the best technics I've seen
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Old 21st May 2004, 08:49 AM   #5
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Quote:
So no-one has done anything unique for pwr supplies?
I made these....

Click the image to open in full size.

It allows the transformer to be inside the amp but sitting on the equipment shelf with hardly any contact with the amp case.
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Old 21st May 2004, 10:46 AM   #6
troystg is offline troystg  United States
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Hey Nuuk-

Now you see that is neat. I hope to try something similar on my project also.

Is that nylon discs on the bottom? What material did you use, and why did you choose it?

Thanks in advance,

Troy
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Old 21st May 2004, 01:51 PM   #7
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Quote:
Is that nylon discs on the bottom? What material did you use, and why did you choose it?
I listened to many different materials for this job and found that this particular type of plastic sounded best

OR

It was something that I had lying around and cost me nothing.

I'll let you guys decide which is the right answer!
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Old 21st May 2004, 02:32 PM   #8
troystg is offline troystg  United States
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Hey Nuuk-

Well reason I was curious on the material type was because I just saw this:

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3815940968

Would be perfect for gainclone troids but I think just a little pricy for our use.

Troy
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Old 21st May 2004, 02:39 PM   #9
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The truth is that almost any fairly rigid material will do Troy and in my book, the less it costs, the better

Of course, the base will just show under the amplifier so I would not favour plywood for instance. The pieces of polycarbonate (I think that is what I used) were dumped from a local factory and I got to them before the garbage men!

After two years I am still awaiting the next 'dumping'.
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Old 24th May 2004, 10:14 PM   #10
troystg is offline troystg  United States
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Actually I won the auction for these Teflon disks.

I will experiment with putting my transformers on them and attaching the chassis spike to the bottom part of the bolt to isolate the troids from the chassis completely.

I won 23 disks so I have LOTS to experiment with.

For my first GC amp the pwr supps will be external, but I hope to eventually make a single chassis stereo unit with pwr supps in the same box where these "may" make a difference.

Troy


edit: added "where these "may" make a difference" so the inclusion of future plans has some relevance.
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