dual primary//dual secondary toroid

larryg · 31st August 2006, 03:54 PM

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

richie00boy · 31st August 2006, 03:58 PM

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.

Nuuk · 31st August 2006, 06:52 PM

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!

larryg · 31st August 2006, 08:35 PM

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

Nuuk · 31st August 2006, 08:45 PM

Your question is answered on that link I gave you.

larryg · 31st August 2006, 09:29 PM

THANKS NUUK, larryg

AndrewT · 1st September 2006, 11:11 AM

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.

richie00boy · 1st September 2006, 11:30 AM

The two rectifier bridge approach gives a better quality ground and loading of the transformer. The matter would be slight for a gainclone though.

AndrewT · 1st September 2006, 12:10 PM

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.

richie00boy · 4th September 2006, 09:06 AM

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.

31st August 2006, 03:54 PM	#1
larryg diyAudio Member Join Date: Feb 2004 Location: cary,n.c.	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 __________________ larryg

31st August 2006, 03:58 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ And yes, there are capacitors in the circuit. One is even employed to form the dreaded bootstrap on the voltage gain stage. Get over it. -Burning Amplifier #2, Nelson Pass www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

31st August 2006, 06:52 PM	#3
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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! __________________ Nuuk The truth need not be veiled, for it veils itself from the eyes of the ignorant.

31st August 2006, 08:35 PM	#4
larryg diyAudio Member Join Date: Feb 2004 Location: cary,n.c.	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 __________________ larryg

31st August 2006, 08:45 PM	#5
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Your question is answered on that link I gave you. __________________ Nuuk The truth need not be veiled, for it veils itself from the eyes of the ignorant.


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31st August 2006, 09:29 PM	#6
larryg diyAudio Member Join Date: Feb 2004 Location: cary,n.c.	THANKS NUUK, larryg __________________ larryg

1st September 2006, 11:30 AM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The two rectifier bridge approach gives a better quality ground and loading of the transformer. The matter would be slight for a gainclone though. __________________ And yes, there are capacitors in the circuit. One is even employed to form the dreaded bootstrap on the voltage gain stage. Get over it. -Burning Amplifier #2, Nelson Pass www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

4th September 2006, 09:06 AM	#10
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ And yes, there are capacitors in the circuit. One is even employed to form the dreaded bootstrap on the voltage gain stage. Get over it. -Burning Amplifier #2, Nelson Pass www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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