A switching regulator includes a reference voltage generator and a switching-regulating module. A guidewire may be coupled to a surgical device for positioning and actuating. On impact with the target, the Nitinol undergoes a strain-induced shift to an ultra-high strength state in which the projectile is capable of remaining intact and concentrating its full energy on the small area of contact for maximal penetration and damage to the target instead of mushrooming widely and spreading its energy over a wide area as conventional projectiles do. The technique is applicable to small circuits having relatively few transistors, and especially well suited for integrated circuits having millions of transistors and components.