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Old 10th November 2012, 12:11 PM   #11
DF96 is offline DF96  England
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0-9 - 0-9 -CT- 0-9 - 0-9

If you can connect two 9V secondaries then you can connect four 9V secondaries, in exactly the same way.
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Old 10th November 2012, 01:00 PM   #12
DUG is offline DUG  Canada
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Is this what you are trying to do?

With two diode bridges the phase relationship of the transformer secondaries does not matter.

When using a single diode bridge the phase is important.
Note the phase dots on the secondaries.

This is what (I think) DF96 was mentioning in post #2.

Sometimes a picture is worth a dozen posts.
Attached Images
File Type: jpg PS-DUAL--SPLIT.JPG (16.8 KB, 69 views)
File Type: jpg PS-DUAL--SPLIT-B.JPG (15.8 KB, 67 views)
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Old 10th November 2012, 01:33 PM   #13
DF96 is offline DF96  England
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Yes, either way will work but the OP was specifically asking about a CT (as he may be constrained by an existing PSU circuit).
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Old 10th November 2012, 01:49 PM   #14
DUG is offline DUG  Canada
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I must have missed the CT reference.

I also have to correct the single bridge circuit to show the phase of the primary of each transformer. (more dot, etc.)

(my bad)
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File Type: jpg PS-DUAL--SPLIT-B.JPG (16.9 KB, 65 views)
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Old 10th November 2012, 02:35 PM   #15
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by MarianB View Post
It is as simple as connecting the 2 transformers in series, theyr windings are not part of the same magnetic core so there is no special way to connect them, there is no phase to worry about, just connect the in series and then check the voltage
This is dangerous.
DF has already corrected you.

If this is an indication of your level of competence, then stop posting mains advice until after you have learned to speak sense !!!!! and safely !!!!!!
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Old 10th November 2012, 02:40 PM   #16
AndrewT is offline AndrewT  Scotland
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All three pics of Dug's posts 12 & 14 are correct. BUT NOTE the Phasing dots. These can be wrongly coded on a transformer. Don't accept the code as bible, test properly !!!!!!
You can safely adopt any of those schematics that suit your following circuit.

DF mentioned a bulb limiter.

I wish I had thought of that title before I repeatedly called it up as "mains bulb tester" (or bulb tester).
Build one of these. Threads all over the Forum on build and use details.

It will save many transformers and projects and even fuses from total destruction.
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Last edited by AndrewT; 10th November 2012 at 02:43 PM.
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Old 10th November 2012, 06:12 PM   #17
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thank you gents. and doug, the picture indeed snapped my comprehension imto focus. the trafos are conmected like pic1 and making my amp sing beautifully at the moment
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Old 11th November 2012, 11:53 PM   #18
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Put the two separate transformers on ebay and buy a single transformer.
This will be neater and take up less space.
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