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    Ideas for a replacement PSU?

    i think you can go to this page http://www.echoaudio.com/forum/ maybe there are lots of people who can share their ideas with youll ;)
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    eletronic simulation

    maybe you can download some trial version like proteus (schematic capture,simulation, and PCB design + 3D output view...) ;)  ;)  ;)
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    Where to ground on a PCB?

    we normally connect the ground (low side) to the negative supply, (only if positive power +, and ground "gnd." , are specified in you're schematic diagram, but, if the schematic diagram tells you that, " +, gnd, -", it means you are going to use a power supply with positive,ground,and negative...
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    Re: sizing pc board artwork

    if you are using Proteus software, you can set your PCB by setting first the work area,(in inches or in cenrimeters) then just follow the box, and there you have it, :D
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