A new fuze that reduces projectile miss-distance to a target, by correcting for discrepancies in anticipated round velocities through its flight. In one example, the SD DAC may include a current source configured to provide a differential current. Input and drain connections are also preferably made through the top cover member. The pool cleaning vehicle includes a drive mechanism which in different embodiments has pairs of wheels andor rollers and various combinations thereof for moving the vehicle. The invention further comprises one or more pipelined compressors to speed up the shift-inshift-out operation during compression. The securing member is configured for securing the clamping elements and the optical members together in such a manner that the optical members can be removed from the base.