Quantity   Component name
1 × AT&T CL2909 Cheap ($20 at Walmart), Ample unused internal space, 'modern' circuit board layout.
1 × Raspberry Pi Model B++ No 'on-board' sound recording facilities, so two USB ports are needed. To be further modified.
1 × Sabrent USB Audio Adapter For simple 'recording', $10 at 'Microcenter, other options less elsewhere. Know to work with the 'Pi'
10 × NPN transistors
1 × Fiberglass Pencil More on this later. Harder to 'find' at the big houses but *amazing* at removing solder mask/rework/revealing traces (http://www.amazon.com/Scratch-Brush-Fiberglass-Colors-vary/dp/B0019V18D2/ref=sr_1_1?ie=UTF8&qid=1430441075&sr=8-1&keywords=fiberglass+pencil)
1 × PCB Carbide Micro Drill Bit Set Kit 0.3 - 1.2 mm Search EBay for best prices