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Old 6th September 2002, 02:29 PM   #11
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Hi,

Thanks for all of the replies. I should have been more specific, but we ended up getting lots of good information. I was only planning on physical stacking, not electrical, but good information for future reference. I will separate the toroids. I just wanted to keep all signal wires away from the trannies. Guess that I'll use some shielded cable.

Best Regards,

Dale
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Old 6th September 2002, 03:30 PM   #12
e96mlo is offline e96mlo  Sweden
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Toroids are known to have very little magnetic leakage. Is it really enough to couple them in a faulty way so that they may be damaged?
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Old 6th September 2002, 04:30 PM   #13
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Dale.
I stacked the toroids on my BOSOZ preamp with no problems.
Very quiet, no noise or interference or death rays.
The world didn't come to an end.

So configured specifically for that project it worked fine.

You can see it on the Pass DIY gallery. It's the one in two separate chassis(one for power supply, one for signal) with Lacewood fronts and just one black knob.

Cheers, Tim.
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Old 6th September 2002, 04:51 PM   #14
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I've used several transfos too for my amp, it runs smoothly:

2 X two transformators in parallel
1 bridge rectifier
2 huge caps

Another trick to check the phase of your transformators, place two (equal) transformators in series and connect them to the same mains. Now you can measure the total voltage, if you measure nothing the transformators are placed in opposite phase, if you measure twice the voltage of a single one, the phase is the same. Now you can mark the wires.

HB.
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Old 6th September 2002, 06:34 PM   #15
skaara is offline skaara  Slovenia
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You short them, if you dont get a spark its opposite phase, if you get a spark, congratz you know theyre connected right and youre temporairly out of hearing
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Old 6th September 2002, 06:35 PM   #16
skaara is offline skaara  Slovenia
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I do this with small wattage trafos, no time consuming and no sparks which would make your hair look different
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Old 9th September 2002, 10:01 AM   #17
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Quote:
If you physically stack the transformers, their magnetic flux might be out of phase and they can damage eachother because there's enough magnetic flux to couple them together as one transformer
No, no no! Wrong again! Most of the flux stays inside the transformer core, so stacking two on top of each other is NOT the same as magnetic coupling. You're mistaking a transformer for a coil.

leroy
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Old 9th September 2002, 10:18 AM   #18
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Default Ideal Transformers ?

Quote:
Originally posted by leroy

No, no no! Wrong again! Most of the flux stays inside the transformer core, so stacking two on top of each other is NOT the same as magnetic coupling. You're mistaking a transformer for a coil.
Well thats true if the transformer is ideal, this however is seldom the case, so it's likly that the transformers can "see" eachother"

But if you happen to get your hands on some ideal transformes, I'd sure like to buy som

\Jens
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Old 9th September 2002, 10:29 AM   #19
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When I said 'most of the flux stays inside the transformer' it already covered the non-ideal transformer model.
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Old 9th September 2002, 04:13 PM   #20
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I have place two toroid on top of each other, worked just fine. I connected the secodary windings in series in order to create 2 x 48 VAC. The toriods were 2 x 24 VAC.
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