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need help on transformer secondaries connection
need help on transformer secondaries connection
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Old 26th September 2008, 03:32 AM   #1
atenolol50 is offline atenolol50  Singapore
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Default need help on transformer secondaries connection

My transformer comes with 2 sets of 3.15-0-3.15 secondary windings.
Is it possible connect them together to get a 12.6VAC?
If so how?


Thanks.
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Old 26th September 2008, 07:28 AM   #2
geoff4valves is offline geoff4valves  United Kingdom
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Yes. Connect them in series. You will need to connect a meter across the final pair of leads to make sure the windings are in phase. You should get the full 12.6, probably slightly over when off load, volts if correctly connected. If you get hardly anything swap ONE pair of winding leads over. It should look like this; start (out put) of winding one - centre tap - finish of winding one is connected to start of winding two - centre tap - finish winding two, which will be your other output.



Geoff.
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Old 26th September 2008, 08:06 AM   #3
atenolol50 is offline atenolol50  Singapore
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let me know if this is correct.

Click the image to open in full size.Click the image to open in full size.

Do I then short the 2 centre taps (GRY and WHI) to end up with a 6.3v-0-6.3v?

Each winding is rated @1.2A, is the current doubled as a result of the series connection?
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Old 26th September 2008, 08:15 AM   #4
Colt45 is offline Colt45  Serbia
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just float the centre taps.
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Old 26th September 2008, 08:23 AM   #5
geoff4valves is offline geoff4valves  United Kingdom
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That circuit looks correct as it is. Do not connect the centre taps together, just leave them as spurs. The current will remain at 1.2 amps as they are in series.



Geoff.
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Old 26th September 2008, 08:26 AM   #6
Akita is offline Akita  Malaysia
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Your ac to ac output will give you 12.6vac

Do I then short the 2 centre taps (GRY and WHI) to end up with a 6.3v-0-6.3v?

No, you won't get it by shorting the center taps (gry & whi).
To get 6.3v-0-6.3v : the center jumper ORG & Yel will be 0v, The ac output will be 6.3v

[I]Each winding is rated @1.2A, is the current doubled as a result of the series connection?{/I]

No, the rated 1.2A will be doubled only by parallel it. You will only get 6.3v-0v, 2.4A by connecthing the top ORG to the top Yel, bottom ORG with bottom Yel.
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Old 26th September 2008, 08:52 AM   #7
atenolol50 is offline atenolol50  Singapore
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thanks dudes, great help.
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