This is what I use. Seems to work very well.
This is to take with a pinch of caveat.
In oder to produce a clean 48V, the unregulated voltage at the input of the TL783 must be at least 52V; taking into account ripple and possible mains voltage variations, the design target should be about 56V. This implies that the secondary delivers at least 2x21Vac, which in turn results in 28V unregulated at the input of the 18V regulators. The regulators have to dissipate 10V, which is not without creating issues.
A better alternative consists in referencing the negative input of the bridge to the unregulated +. Then , the circuit becomes a tripler instead of a doubler, and a 2x15V xfmr can produce 56V and 2x19V unregulated, enough for 2x15V and 48V regulated, but not enough for 2x18 regulated.
A 2x18Vac xfmr produces 2x23 + 72V unregulated in the same conditions.