Note on 4 May 2020 : The boards are now in green. This listing is a bare board of a super heavy duty power supply making use of five pieces of popular LT1083CP low noise regulator IC ( Alternatively, LM338 can be used too, but the LM338 has a package of TO-220 and different lead pitch so the legs need to be stretched during soldering). LT1083 family has been famous as a low noise low impedance design being used in audio circuitry like DAC circuitry , filament powering, to name a few. LT1083CP has a current rating of 7A. Thus the theoretical maximum current rating is 35A. For practical application with massive heatsinking a continuous current of 20A is achievable. The board allows an adjustable voltage range from DC +4V to +30V( single rail) by the on-board trimming potentiometer. The board allows direct mounting of LM1083CP on the board and massive heatsink on the LM1083CP. Operating voltage : AC 5Vx2 to 30Vx2 PCB dimension : 150mm x 122mm. Board thickness : 1.6mm . Board color : Blue. PCB finishing : 75um copper thickness( four times normal thickness !) with gold plating surface. Both side has solder mask coated for maximum durability. We provide schematic and part list to buyers by email. We do air shipping worldwide at US$7.00. We welcome combine shipping.