Transformer series wiring questions

chipco3434 · 8th January 2005, 05:23 PM

I'll try to make this clear as possible.

I bought some PE toroids that are 14VCT (when in phase!). They produce +/-10.5VDC after rectification and caps. I need to get them up to a +/- 12VDC or +/- 15VDC rectified supply.

I understand that the transformers can be wired in series... What are the precautions necessary? Are all the CT's tied together to form ground down stream? So the scheme would be... (ASCI on!)

..................|......|..............|.....|
...................120VAC 120VAC
..................______ ........._______
..28VAC ~ tranny ~ tie ~ tranny ~ 28VAC
.....|..............|................|............ ..|
.......................CT----tie-----CT
.................................|
...............................___
...............................___

It's also possible to combine the rectified outputs of two transformers, right?

............ ______ ~.........+ Vcc+
tranny |..................rect
............ ______ ~......... -
...................................|. . . . . .<--is this right????
...Both CT's--------------|-----------ground -0-V
..............______ ~ ........+
tranny |...................rect
..............______ ~ .........- Vcc-

Which is preferable?

Help a nuub out.

Thank you in advance!

EDIT: Sorry for the periods. It seems that leading spaces don't work in the message window.

sam9 · 8th January 2005, 06:21 PM

[FONT=courier new]

---o------ ---------------------- ~
| ) || (
| ) || (___#
| ) || (
| ) || (
| |---- --------|
| | o-------- GND
|-|---- --------|
| ) || (
| ) || (____#
| ) || (
| ) || (
-----o----- --------------------------- ~

#= Just cap it off the wire(s) If two wires joint and cap off

o = Connect the wires.

This will give you more voltage than it sounds like you need so you will probably have to regulate it down.

sam9 · 8th January 2005, 06:23 PM

That last post didn't comeout right. A lot of spaces on the left were supressed. Nows it looks like mush. Maybe someone else can draw it.

chipco3434 · 8th January 2005, 08:13 PM

I think I get it. Cap off the CT's on both traffos. Those are represented by the #'s. Then wire traffos in series. That connection of the traffos is the new CT -0- ground. The two legs left over are 28 VAC~ out legs. Right?

ASCI schematics!!!

AndrewT · 8th January 2005, 08:14 PM

Hi,
what have you got at present?
I'm guessing that you have 2 or more similar toroids, each with two secondaries.
What is the voltage on each secondary?
regards Andrew T.

moamps · 8th January 2005, 08:46 PM

.

chipco3434 · 9th January 2005, 12:48 AM

Thanks to all... up and running ~ +/- 20VDC and mounted on a board. Of co**** it looks like a third grader did it but at least the caps are straight.

No fuses blown, no fires or rescue trucks!

Now for the regulators!

8th January 2005, 05:23 PM	#1
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	Transformer series wiring questions I'll try to make this clear as possible. I bought some PE toroids that are 14VCT (when in phase!). They produce +/-10.5VDC after rectification and caps. I need to get them up to a +/- 12VDC or +/- 15VDC rectified supply. I understand that the transformers can be wired in series... What are the precautions necessary? Are all the CT's tied together to form ground down stream? So the scheme would be... (ASCI on!) ..................\|......\|..............\|.....\| ...................120VAC 120VAC ..................______ ........._______ ..28VAC ~ tranny ~ tie ~ tranny ~ 28VAC .....\|..............\|................\|............ ..\| .......................CT----tie-----CT .................................\| ...............................___ ...............................___ It's also possible to combine the rectified outputs of two transformers, right? ............ ______ ~.........+ Vcc+ tranny \|..................rect ............ ______ ~......... - ...................................\|. . . . . .<--is this right???? ...Both CT's--------------\|-----------ground -0-V ..............______ ~ ........+ tranny \|...................rect ..............______ ~ .........- Vcc- Which is preferable? Help a nuub out. Thank you in advance! EDIT: Sorry for the periods. It seems that leading spaces don't work in the message window.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Transformer wiring question, series, parallel and center tapped	swin1	Power Supplies	12	7th November 2008 07:58 PM
Series wiring (Qts) Query	badgerboy	Full Range	4	30th August 2006 11:52 AM
Series wiring for heaters	XZur	Tubes / Valves	5	19th December 2005 02:43 AM
series wiring	mvagusta	Multi-Way	15	1st September 2004 07:17 PM
Series Wiring	Rory	Multi-Way	10	10th September 2001 03:27 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

8th January 2005, 06:21 PM	#2
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	[FONT=courier new] ---o------ ---------------------- ~ \| ) \|\| ( \| ) \|\| (___# \| ) \|\| ( \| ) \|\| ( \| \|---- --------\| \| \| o-------- GND \|-\|---- --------\| \| ) \|\| ( \| ) \|\| (____# \| ) \|\| ( \| ) \|\| ( -----o----- --------------------------- ~ #= Just cap it off the wire(s) If two wires joint and cap off o = Connect the wires. This will give you more voltage than it sounds like you need so you will probably have to regulate it down.

8th January 2005, 06:23 PM	#3
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	That last post didn't comeout right. A lot of spaces on the left were supressed. Nows it looks like mush. Maybe someone else can draw it.

8th January 2005, 08:13 PM	#4
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	I think I get it. Cap off the CT's on both traffos. Those are represented by the #'s. Then wire traffos in series. That connection of the traffos is the new CT -0- ground. The two legs left over are 28 VAC~ out legs. Right? ASCI schematics!!!

8th January 2005, 08:14 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, what have you got at present? I'm guessing that you have 2 or more similar toroids, each with two secondaries. What is the voltage on each secondary? regards Andrew T.

9th January 2005, 12:48 AM	#7
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	Thanks to all... up and running ~ +/- 20VDC and mounted on a board. Of co**** it looks like a third grader did it but at least the caps are straight. No fuses blown, no fires or rescue trucks! Now for the regulators!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)