need help on transformer secondaries connection

atenolol50 · 26th September 2008, 03:32 AM

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.

geoff4valves · 26th September 2008, 07:28 AM

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.

atenolol50 · 26th September 2008, 08:06 AM

let me know if this is correct.

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?

Colt45 · 26th September 2008, 08:15 AM

just float the centre taps.

geoff4valves · 26th September 2008, 08:23 AM

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.

Akita · 26th September 2008, 08:26 AM

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.

atenolol50 · 26th September 2008, 08:52 AM

thanks dudes, great help.

26th September 2008, 03:32 AM	#1
atenolol50 diyAudio Member Join Date: Nov 2004 Location: Singapore	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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26th September 2008, 07:28 AM	#2
geoff4valves diyAudio Member Join Date: Sep 2008	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.

26th September 2008, 08:06 AM	#3
atenolol50 diyAudio Member Join Date: Nov 2004 Location: Singapore	let me know if this is correct. 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?

26th September 2008, 08:15 AM	#4
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	just float the centre taps.

26th September 2008, 08:23 AM	#5
geoff4valves diyAudio Member Join Date: Sep 2008	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.

26th September 2008, 08:26 AM	#6
Akita diyAudio Member Join Date: Dec 2006 Location: Kuala Lumpur	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.

26th September 2008, 08:52 AM	#7
atenolol50 diyAudio Member Join Date: Nov 2004 Location: Singapore	thanks dudes, great help.