Alternatively, you can use a PC power supply. Two main types available AT (old) & ATX. I would not recommend the AT power supplies as they normally have an external mains switch. The ATX power supplies keep the mains within the box. They are fitted with either a 20 or 24 way connector The colour coding on the above diagram normally corresponds with the wire colours, although I have seen different wire colours used !!! To get the supply to work connect the PS_ON# wire to COMMON. If you do this via an off / on switch you can have a remote off/on switch. Note just like a PC, it will consume some power while in standby mode. The +12V DC, +5V DC and +3.3V DC lines will provide significant amounts of current, and may be advisable to install current protection for the circuit. For example http://www.amazon.co.uk/gp/product/B00P2GE38C?keywords=atx%20psu&qid=1450616476&ref_=sr_1_7&sr=8-7 Provides the following output currents +3.3V 26A; +5V 27A;+12V 22A Paul
