These are two PCBs of a very low noise PSU board based on LT1963A. LT1963A is one of the few low noise and high current LDOs that is proven to have excellent performance for audio application. The board can be used as either for filament , DAC circuit or any linear circuit. For current higher than continuous current of 300mA, heatsink has to be added at the back. The listing is for two pieces of boards. The assembled board pictures are for reference. The listing is for two pieces of bare boards. Supply voltage : AC 3V to AC 14V The PCB has a board thickness of 1.6mm, and copper thickness of 70um. This is four times normal board copper thickness ! PCB dimension : 80mm x 27mm We provide schematic and part list to buyers by EMAIL( to be attached to the shipment notice). We do air shipping worldwide at US$6.00. We welcome combine shipping. Powered by SoldEazy