is there an electronics ebook for hacking sub-assemblies into project ideas, or finding new uses for used electronics. for example turning an old CD player into a function generator, stripping out unrelated sub-assemblies, inserting a function generator, while using existing digital readout, and related faceplate buttons, etc? Or, converting an old Cassette deck into something that uses some of the sub-assemblies already in the deck? I don't know what, say, a combined DSL router and print server? Alternatively, an idea book for this type of hack projects? I have been to the Instructables, many are just silly or dumb. others are clever, yet have a clumsy housing. Any input, suggestions, or suggested starting points would be greatly appreciated.