I found ripples in the input of the 12V regulator, with a cap of 470uF at 100V it was better, however, at the input of the 5 volts regulator it is ok, no ripples with a electrolitic cap of 100uF at 50V.
As Nigel sais, I have to come back to the store to buy the 1000uF, I was confused and I asked a 10,000uF, I was amaized when I saw the big cap.
well, with the transformer 120/12Vac, I do not see more than 8 volts regulated so that why I choosed the 120/24Vac, the adviced TheOne let me know is true but I think it concerns when I do not take into account the central tap.
In this app. I am using the central tap so I see half the entire signal If I measure from the two extremes of the transformer.
If I am wrong, let me know