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Old 23rd July 2009, 06:44 PM   #1
Brit01 is offline Brit01  United Kingdom
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Default 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.

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Old 23rd July 2009, 06:54 PM   #2
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Default Re: Quick transformer question

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.
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Old 23rd July 2009, 06:57 PM   #3
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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.
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Old 23rd July 2009, 07:09 PM   #4
Brit01 is offline Brit01  United Kingdom
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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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Old 23rd July 2009, 07:25 PM   #5
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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.
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Old 23rd July 2009, 07:26 PM   #6
Brit01 is offline Brit01  United Kingdom
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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.
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