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Old 17th December 2013, 12:45 PM   #1
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Join Date: Dec 2009
Default toroidal with no information

hi everyone
i start ti build the class A amplifier according to "diyaudio-f5-build-guide" pdf.

today its my lucky day:
some friend give me big DC power supply module that supply up to 36v-DC. (picture)
i disassemble it and take the toroidal. the toroeid as 2 group of wire, i sepuse because the module have 2 DC channels.


i measure the voltage and i found 16v ac for each group.

the problem:
1) the guide for the amplifier required 18v-ac
2) the power supply module (not the toroidal only) can rise to 36v-dc

can i get with this toroidal 18vac for the amplifier?
maybe i need to do some mix with the wire?
the ampere is ok for this class A amp?

i add some picture.
thanks
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Old 17th December 2013, 01:06 PM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
The higher current outputs are 0-9.7Vac and
0 - 16 - 29 - 36.5Vac
These do not provide a symmetrical supply for a dual polarity PSU.

The two lower current windings are no good for a Power Amplifier.

The transformer is 149VA going by the specification printed.
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Old 17th December 2013, 02:50 PM   #3
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hi andrew
why i cant take the 16vac wires (black & Gray right in the picture) and anothere 16van wire(black & Gray left in the picture) for the amplifier?
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Old 17th December 2013, 03:02 PM   #4
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Join Date: Jun 2011
Quote:
Originally Posted by erez1012 View Post
hi andrew
why i cant take the 16vac wires (black & Gray right in the picture) and anothere 16van wire(black & Gray left in the picture) for the amplifier?
Those are not internally connected??? Measure resistance between GRAY-GRAY...
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Old 17th December 2013, 03:20 PM   #5
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i hope this is good news
resistance gray-black (left in the picture) = 0
resistance gray-black (right in the picture) = 0

resistance gray-gray(left&right in the picture) = inf
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Old 17th December 2013, 03:26 PM   #6
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pic of the gray-gray resistance
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Old 17th December 2013, 05:14 PM   #7
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Join Date: Jun 2011
Looks promising to me...
Go make a PSU prototype of it then...
:-)
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Old 17th December 2013, 07:21 PM   #8
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now im confuse, i need to connect the too black wire?
what i connect to where in the diode bridge?
the ampere is ok for my amp?, the volt?
thanks
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Old 17th December 2013, 08:25 PM   #9
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

If you don't know the answers to your own questions
you should not be building amplifiers. Its frightening
to see lots of test kit and no idea how to use it.

rgds, sreten.

16VAC will do as a substitute for 18VAC usually.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 17th December 2013, 08:41 PM   #10
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Join Date: Dec 2009
Hi sreten
as you can see, its not a normal toroidal so i want to be sure about the next step.
i think i have the Knowledge to build the amplifier, with the extra help from this forum.
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