In the preceding chapters, it has been explained that the design of vibrator transformers differs considerably from that of small AC transformers. The principal difference is primarily the result of limiting factors and characteristics of the vibrator, the contacts of which must commutate the direct current of an inductive circuit. Therefore, design decisions can only be made after the possible effect on the vibrator performance and life have been determined. All of the power supply components, including the smoothing filter, shields, and interference filter parts, must be arranged and assembled on the chassis in the most advantageous manner. While the application requirements may have considerable influence on the lay-out, there are certain procedures that can be followed to advantage.