Abstract: A portable shelter (10) provides protection for users (18) of an individual float tube (12) or a pontoon style kick board (76). The shelter (10) comprises a covering 32 having transparent front panels (39), transparent side and rear panels (34,37), and translucent or opaque lower front panels (36a), side panels (36c) and rear panels (36b). A flexible longitudinal rod (38) and transverse rod (40) maintain the dome-like configuration of the shelter (10). It is easily mounted on the top surface (22) of the tube (12) by using the straps (60) and side straps (53) and by inserting the transverse rod (40) into side pockets (58) that are in turn inserted between the handles (14) and the tube (12). A rear strap (50) and side straps (60) further secure the shelter (10) to the tube (12). The front flaps (39) open to provide access for fishing, hunting, photography, and the like, or they may be zipped shut for protection from the elements and greater concealment.

Abstract: A regulated power supply control system with adjustable operating point and adjustable dynamic behavior for use with electronic power supply circuits, such as musical instrument amplifiers. The control system includes a measurement circuit (20) that generates a measured signal (22) based on an observed signal (18) in an amplifier (10); a sag control circuit (24) that generates a sag signal (32) based on the measured signal (22); a referenced circuit (34) that generates a static reference signal (38); and a regulator (44) that uses the static reference signal (38) and sag signal (32) to generate a regulated power supply output (14) that is used by the amplifier (10). The sag control circuit (24) permits adjustment of the sag signal 32 by a user-operated sag magnitude control (26), sag rate control (28), and sag recovery rate control (30).