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Transient current instability is one of the most common faults evident in Pulse Width Modulation (PWM) controlled brushless DC motors. This paper explores the underdeveloped field of real-time acoustic diagnostics for electrically based faults using consumer grade sensors. Current instabilities produce an audible torque transient on the motor, easily detectable using consumer acoustic sensors; a USB microphone and smartphone in this case. Two time-frequency signal processing techniques, Waveletdoi:10.1109/codit.2018.8394809 dblp:conf/codit/GrebenikBS18 fatcat:pzaczlwsafbyvgxir57v6cxqfe