I have one of those cheap rebadged power supply and if you want to buy one be notified that the current pot is a fucking single turn pot, so you can’t tune reasonably well the output current and sometimes it will send out hundred of mA without any kind of issues if you had the infortunate idea of tweaking the pot. Besides the ampmeter is scaled at 10 of mA and for low current application it’s useless !!
However the volt pot is a multi-tour pot. Don’t ask me why, I don’t know. It’s cheap for sure but it remains that It’s a real pain in the ass to work with ! I may take it appart and replace the current pot.
Also note the second channel layout is a mirror of the first one. So the pot layout makes any kind of sens for an efficient use.
On the other hand, I also have this old well-built power supply that works wonderfully well with a nice feeling and it’s a real pleasure to work with it. However, I can’t because most of the time I need a dual power supply ! The only complain is the odd construction technique.
So, choose your tool with care but having low budget isn’t helping !
Source (and if you want to buy one) : http://www.ebay.fr/itm/SODILEC-SDL-GAR-402-POWER-SUPPLY-ALIMENTATION-40V-2A-B248-/281780007639