Abstract: The present invention relates generally to the field of electret capsule, and more particularly to a circuit configuration of an impedance converter integrated in an electret capsule such as for use in condenser microphones. The electret capsule of a microphone may include a gate biasing field effect transistor (FET) to facilitate biasing of a low noise FET. Advantageously, the use of low noise FET in the electret capsule of a microphone provides for a reduced cost, while achieving lower self-noise.

Abstract: A modular furniture system including modules and frames. Each module includes an upper face including a plurality of upper engaging portions, a lower face including a plurality of complementary lower engaging portions, and four sides. Frames are provided with a regular cross-sectional dimension. The dimensions of the upper and lower faces of the modules and the arrangement of the engaging portions are such that when two modules are adjacently disposed with frames mounted on the adjacent sides thereof, the distance between any two adjacent engaging portions on the same horizontal plane is constant no matter whether the adjacent engaging portions are on the same module or different modules. Sleeves with drawers corresponding to modules of a given size are also provided.