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Old 31st August 2006, 02:54 PM   #1
larryg is offline larryg  United States
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Question dual primary//dual secondary toroid

My question is: four primary leads-- 0v white; 117v yellow (first primary) (second primary)-- 0v orange; 117v black.
The dual secondary is 24v x two.
Product note states; primary leads connect in series or parallel.
117/234 v. Should the secondaries connect to a single primary(117v)? Or, can they be connected; primary 1 to secondary 1 &
primary 2 to secondary 2? Note: will use 2 bridge rectifiers
Help will be 'much' appreciated. larryg
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Old 31st August 2006, 02:58 PM   #2
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The secondaries don't connect to the primary at all.

I strongly suggest you put whatever project you have on hold and read some basic electrics before you proceed, you seem awfully close to death.
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Old 31st August 2006, 05:52 PM   #3
Nuuk is offline Nuuk  United Kingdom
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I agree with Ritchie 100%!

Start here and make quite sure that you at least know the basics before you even go near the mains supply!
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Old 31st August 2006, 07:35 PM   #4
larryg is offline larryg  United States
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THANKS FOR YOUR REPLY RICHIE&NUUK. IN USING THE WORD
[ CONNECT ], I MADE A POOR CHOICE IN MY POST. I DO KNOW
THE PRIMARIES(ONE OR TWO) CONNECT TO THE MAIN, THE SECONDARIES TO RECTIFIER(S), FOR THE REQUIRED DC. THE MAINS, FOR THE U.S., IS 117V. SO FOR THE TRANSFORMER, ONLY
0NE OF THE PRIMARY LEADS IS CONNECTED TO THE MAINS,117V.
FOR MAINS OF 234V, BOTH TRANSFORMER PRIMARIES ARE USED.
IS THIS CORRECT? IN FUTURE POSTS, I WILL PAY MORE ATTENTION IN CHOICE OF WORDS!
THANKS, larryg
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Old 31st August 2006, 07:45 PM   #5
Nuuk is offline Nuuk  United Kingdom
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Your question is answered on that link I gave you.

Click the image to open in full size.
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Old 31st August 2006, 08:29 PM   #6
larryg is offline larryg  United States
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THANKS NUUK, larryg
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Old 1st September 2006, 10:11 AM   #7
AndrewT is offline AndrewT  Scotland
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Hi,
Quote:
will use 2 bridge rectifiers
why?
one rectifier will do the job and is cheaper/simpler.
You can use two rectifiers to get a slightly increased current if your diode bridge is too near it's rating limits.

If you use only one 117V primary you will massively reduce the VA rating of the transformer. It will be either 50% or 25%, I can't get closer than that.
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Old 1st September 2006, 10:30 AM   #8
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The two rectifier bridge approach gives a better quality ground and loading of the transformer. The matter would be slight for a gainclone though.
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Old 1st September 2006, 11:10 AM   #9
AndrewT is offline AndrewT  Scotland
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Hi,
Quote:
two rectifier bridge approach gives a better quality ground
can you refer to some tech literature that supports your contention?

Similarly
Quote:
and loading of the transformer
prove it to us.
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Old 4th September 2006, 08:06 AM   #10
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I thought I had already explained both these points to you sometime in the last couple of months. IIRC you said you were going to look into what I said, but I never saw anything back from you.
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