LM3886 - LINTRON Toroidal Transformer 15V @ 30VA??

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that confirms the red to red is the low voltage winding.

Just one secondary.

There are options on how you rectify.
You can use a bridge rectifier for a single polarity DC supply ~1.4*Vac
There are quite a few others ways, if you need something else.
 
Build up a Mains Bulb Tester.

Use it to power up every new mains powered project and use it again for EVERY modification of any mains powered project.
It will save your projects from severe damage, due to silly little errors that can become calamities.
 
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