microphone - Really weird DIY shotgun mic (old, yes, but I just found it again...) - Sound Design Stack Exchange
DIY Ribbon Mic Kits – Bumblebee Pro
Amazon.com : comica Shotgun Microphone, VM20 Professional Super Cardioid Video Microphone with Shock Mount, Camera Microphone Kit for Smartphone/DSLR Camera/Camcorder, Perfect for Interview/Video Recording : Electronics
DIY mics – Dr Badphil
How can we make a shotgun microphone from a dynamic microphone or condenser microphone? - Quora
DIY Microphone Amplifier for Shotgun Microphones - YouTube
Q. Does my shotgun mic have any uses in the studio?