Abstract: A transducer is disclosed for detecting an electrical pulse from a circuit and for generating an output signal in response to each pulse. The transducer includes a first electric coil having two ends adapted for connection with the circuit and a second electric coil having two ends on which the output signal is generated. The coils are coaxially wound together and a rod constructed of a ferromagnetic material is positioned through the rod. A housing also constructed of a ferromagnetic material includes two spaced end portions which contact the opposite ends of the rod. The housing also includes locking tabs which engage and lock the housing to opposite ends of the rod.