Make a LoFi Mic From an Old Telephone Speaker : 5 Steps - Instructables
Telephone Microphone: How to Build A Telephone Microphone | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.
building contact microphones - john grzinich
Use An Old Phone Handset To Produce A Lo-Fi Mic | Production Expert
DIY Telephone Microphone | Lo-Fi Mic | NO Soldering - YouTube