I'm trying to convert mains AC to DC while dissipating as little heat as possible. Some ripple is tolerable if it cuts down on heat so I'm not sure if I need the regulator. I also don't know how well the values I've chosen for the various components will work together. Perhaps there's even a much easier way to go about it.
Finding parts is another concern. For instance, can a 22 volt regulator can even be bought?
Any helpful advice is greatly appreciated.
Here's the circuit diagram: