[Amps] Two transformer questions

[Will Matney]

Bill,

Your correct. Power transformer toroids though are made with steel ribbon wound up into a toroid. They will couple more than powdered iron or ferrite over this. However, toroids don't couple as easy as an EI or C-core would setting side by side butted together. He might get by with less than a 1" spacing, I'm not sure without checking it as you say. I know from experience using EI cores, a 1 inch air gap between the cores worked. I seen some once mounted next to each other and touching. They did interact and actually got that leg of each transformer hot from I guess one bucking the other. What you really have to watch for is audio (impedance) transformers mounted side by side. I think he'll be ok by spacing them apart but the air gap, I'm just guessing at from experience with EI cores.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 2/20/06 at 7:37 PM Bill Turner wrote:

>ORIGINAL MESSAGE:
>
>At 06:18 PM 2/20/2006, gd0tep at Safe-mail.net wrote:
>>Ah, OK.. there isn't enough room for a right angle stack, but what 
>>if I stacked them one on top of the other, with about 1" between 
>>them, and some sort of steel plate between them that's part of the
>cabinet?
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Here's a thought. I haven't actually tried this but I think it should 
>answer your question. If anyone spots an error in my thinking, please say
>so.
>
>As a rough test, connect the two in series and measure the resultant 
>inductance. Start with them far apart and move them closer together. 
>When the inductance starts to change, you have coupling between the 
>two. Toroids are notoriously hard to couple together so you may find 
>you can get them quite close with no interaction.
>
>Please let us know what you find.
>
>73, Bill W6WRT
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