What does 4. 0VA rating for transformer mean? Transformers inherently handle only AC. Unless your tranformer is just plain broken (probably not), it is putting out somewhere around 1. V AC as specified. If you're reading this with a DC voltmeter, it will read 0. V since that is the DC average. Change the voltmeter to the AC Volts scale, and you should see somewhere around 1.
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V, probably a little higher. The AC voltage needs to be "rectified" to make it DC.
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A quick and dirty method uses a single diode and output capacitor. That basically passes the positive parts of the AC cycle and blocks the negqative. It will have some ripple, but will work since you're going to regulate it down to a much lower voltage. A better method is something called a "full wave bridge".
This uses 4 diodes but harnesses both halves of the AC cycle to contribute to your DC power voltage. Basically, a full wave bridge takes the absolute value of the AC voltage. As Starblue mentioned, either way the DC voltage will come mostly from the peaks of the AC voltage.
These are sqrt(2) higher than the RMS voltage. The 1. 2V spec will also be under maximum load, so the actual voltage will be a bit higher than 1.
V * sqrt(2). 2. W is a lot of heat to get rid of in the regulator. That's too much for a TO- 2. Alternatively, you could use a switching regulator if you feel comfortable with such things. It's more advanced, but is a worthwhile thing to learn.