Quick transformer question

Brit01 · 23rd July 2009, 06:44 PM

If I have 2 secondary windings at 12V 1amp and I wire them in parallel would I get 2 Amps at 12V?

Would this work for 6V heater filaments in series? for example 2 tubes in series with a 700mA draw each.

Cheers

nigelwright7557 · 23rd July 2009, 06:54 PM

Quote:

Originally posted by Brit01
If I have 2 secondary windings at 12V 1amp and I wire them in parallel would I get 2 Amps at 12V?

Would this work for 6V heater filaments in series? for example 2 tubes in series with a 700mA draw each.

Cheers

Yes and yes.

HollowState · 23rd July 2009, 06:57 PM

The answer is yes. However, they must be wired in phase with each other. Out of phase and the tranny will draw tremendous current and burn out. In the case of two transformers, they should be identical.

Brit01 · 23rd July 2009, 07:09 PM

Thks guys.

Identical trannies yes.

How would I know about the phase? Colour coding? Matching the colours?

If the secondary windings have 2 wires coded black and 2 red.
I would connect the black together and take this to eg. pin 4 >5 >pin 4> pin 5> then back to the 2 connected red wires of the 2 secondary windings.

HollowState · 23rd July 2009, 07:25 PM

Quote:

Originally posted by Brit01

How would I know about the phase? Colour coding? Matching the colours?

Color coding should do it providing the manufactuer did their job correctly. Without any testing, you have a 50% chance of getting it right the first time. Put a 60 watt lamp in the primary to be safe on the first power up. (unloaded) If it's right, the lamp won't light.

Brit01 · 23rd July 2009, 07:26 PM

Quote:

Put a 60 watt lamp in the primary to be safe on the first power up. (unloaded) If it's right, the lamp won't light.

Great tip. Thks a lot.

23rd July 2009, 06:44 PM	#1
Brit01 diyAudio Member Join Date: Jul 2008	Quick transformer question If I have 2 secondary windings at 12V 1amp and I wire them in parallel would I get 2 Amps at 12V? Would this work for 6V heater filaments in series? for example 2 tubes in series with a 700mA draw each. Cheers

23rd July 2009, 06:57 PM	#3
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	The answer is yes. However, they must be wired in phase with each other. Out of phase and the tranny will draw tremendous current and burn out. In the case of two transformers, they should be identical. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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23rd July 2009, 07:09 PM	#4
Brit01 diyAudio Member Join Date: Jul 2008	Thks guys. Identical trannies yes. How would I know about the phase? Colour coding? Matching the colours? If the secondary windings have 2 wires coded black and 2 red. I would connect the black together and take this to eg. pin 4 >5 >pin 4> pin 5> then back to the 2 connected red wires of the 2 secondary windings.

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