vvv

i just have the schematics of the original board. I have to design and add 3 variable power supplies.

hi, at work i'm assigned the task of re-designing a pcb. I have to add 3 variable power supplies, we have a 5V fixed input voltage. and i have design a few variable power supplies and lay them out on the board. In addition, I have to design a step up voltage power supply with input voltage as 5V and output voltage swing of 10-20V. I have theorectical knowledge about electrical circuits and how they work but I have never done board deisgn (so to speak). I wanted to get some help with reagrds to this. Are there any good books related to PCB design guidelines/procedure/techniques etc that I could invest in. If any one can direct is some direction I could much appreciate that. Once again, I was looking for any books related to PCB design. From this book I'm hoping to get some practice/experience on design work.