UPDATE: A better and a more advanced design can be learned in this zero crossing controlled surge free transformerless power supply circuit
Z1 = 15V, 1 watt
A neatly drawn PCB for the above high current transformerless power supply may be seen below, it was designed by Mr. Patrick Bruyn, one of the avid followers of this blog.
Update (August 22, 2014)
A deeper analysis of the circuit showed that the triac was dumping a significant amount of current while restricting the surge and controlling the current.
The approach taken in the above circuit for controlling voltage and the surge is negative in terms of efficiency.
In order to obtain the intended results as proposed in the above design and without dumping precious amps, a circuit with exactly opposite response needs to be implemented, as shown below: