From: scepp@shawcross.ca   
      
   "Stoatgobbler"  wrote in message   
   news:VKfnl.2504$dn7.965@newsfe26.ams2...   
   > Shaun wrote:   
   >> "Stoatgobbler"  wrote in message   
   >> news:t1Gml.6176$ot7.1902@newsfe15.ams2...   
   >>> Hi there,   
   >>>   
   >>> Does anyone know if there is a reason why I cannot mount toroidal   
   >>> transformers one on top of another (stacking them) with a single metal   
   >>> mounting bolt going through both? I can't see anything on the web which   
   >>> suggests I don't do this.   
   >>>   
   >>> Stoat   
   >>   
   >> The magnetic flux from one transformer could interact with the other one   
   >> being that they are that close to eachother.  I've seen cases where cases   
   >> where the toroidal transformer was made up of two or more rings stacked   
   >> one on top of the other, and then the wire wrapped around them all.   
   >>   
   >> I used to repair industrial electronics and I've never seen someone stack   
   >> toroidal transformers before.  They mount them side by side with   
   >> clearance.   
   >>   
   >> Shaun   
   >   
   > Well, I've mounted them on top of one another, I can't find any problem   
   > with it.....however....I've got I've used these toroids to create two   
   > split rail power supplies (two independent +22v - 0 - -22v supplies) and   
   > to make them independant I've "lifted" the 0v commons from the chassis   
   > earth via 60ohm resistors. The greater the current I pull out of the power   
   > supply the greater the potential difference across the 60ohm resistor.   
   > when I pull 1.1A from the power supply then I have nearly 17v across the   
   > 60ohm resistor. This voltage does not seem to vary with raising the upper   
   > toroidal away from the lower so I don't think its to do with this.   
   >   
   > I've never "played" with this, I did expect a voltage across it (due to   
   > eddy currents within the transformer?) but I thought it would be   
   > nominal....0.25A is not nominal.   
   >   
   > Is this normal?   
      
   I don't have an answer for you about that.   
      
   Shaun   
      
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