Only about 3 weeks ago I designed the PCBs for the power supplies. They are just designed around LM7805s and any old stuff really. I wanted to put both supplies on one board but the PCB supplier does a minimum of three copies so I slimmed it down and used a pair of separate boards. One will do the DAC alone and the other the PI, screen and HDD.
They are really nothing high tech at all, just a fuse, a bridge rectifier and a 7805 with some decoupling. - I could have bought similar boards fully populated for much less than the PCBs alone cost me (£18 for three) but where’s the fun in that?
They arrived this morning, which I suppose is reasonable timing
I populated them with essentially whatever we had lying around at work - The capacitors are way overkill and I messed up the footprints (I was going to change to a “universal” footprint which would take all kinds of them, but I forgot to do it before I sent the board off)
here’s the layout:
There’s about 8w peak sank into the base plate, more like half that with normal use.