Why yet-yet another? Well, there's tons for the 30A version of this PSU (various clones: Supernight, Mean Well, and several noname), but very few for the (fanless) 20A version. The one I have is the 12V 20A Supernight but it should fit several others (check images). This design is inspired by a couple of others in terms of features, but is done from scratch. OpenSCAD sources included.Bill of materials (links to what I used, but you can substitute): Caution: Linked ammeter is under-rated for this PSU in general (10A vs 20A); however in my application the load does not exceed about 8.5-9A. If your load is higher, you will want to substitute an ammeter with a different shunt (such as this one, although fitting the shunt might be nontrivial; alternatively, just edit the SCAD source to remove ammeter cutout). Instructions: For a DC connector you can use whatever you wish (in the picture it's a couple of quick-connects I had lying around), or you can do just bare wire.