Abstract: A variable area capacitor with a flexible electrode responsive to a physical effect and a rigid electrode with a predetermined surface contour. The surface contour is dimensioned to provide a specific change in capacitance with deflection of the flexible electrode. A thin dielectric layer maintains a substantially fixed spacing between the two electrodes. Preferred embodiments include a pressure sensor, microphone and accelerometer. A differential transconductance amplifier detects changes of the variable capacitor in a low-impedance, bridge-like circuit and feeds back current to balance the bridge. The voltage that controls the feedback current is proportional to capacitance over a wide dynamic range.

Abstract: A cushioned camera case has a tubular body made of thick resilient material without rigid framework and having expansion sections for camera appendages and an easy-open entrance. The tubular body can be cylindrical, rectangular or cubical. The expansion sections can be orifices that are elongated or shaped and positioned for access to particular camera components for allowing certain use of cameras while in the camera cases. This invention can be produced for particular cameras and camcorders or for general use for cameras and camcorders and related items.