I actually use this supply for a wide variety of projects and experiments...that's why the heat sinks are oversized.
You could indeed use smaller heat sinks.
It would be very easy to add a ground plane.
I will look at rearranging the filter caps.
I already have a similar power supply I built last year but
I lost the files in a Hard Drive crash. I decided to design
this one to replace it so I am wide open to suggestions.
Just some quick remarks here for now.
The heat sinks can be made the same size as on the amplifier boards.
Large capacitance is needed more on the input side than on the output side of the regulator. Additionally such large capacitors might benefit from some film or ceramic decoupling capacitors or even snubbers.
Seeing that you have the board space available, consider increasing the size of C1 and C2. Up to at least 470uF is a good idea to improve ripple rejection.
The very large V+ and V- copper areas form an effective antenna loop, together with the wire between PSUs and amp. A top layer ground plane would solve this issue almost completely (just like I described in my post above).
PS: By joining the negative side of the positive supply to the positive side of the negative supply you effectively form a (local) ground star. That's fine, but you could leverage on this by having the screw terminal offer multiple ground point connections. The board space is there. ;)
Edited by Avro_Arrow - 3/30/12 at 5:17pm