Condenser microphone with stable characteristics - has external circuit components embedded in synthetic resin block pressed against inner end ring by screw-in plate

摘要

The condenser microphone is designed so that its electrical properties remain unaltered over a long period of time. It consists of a housing with an inner end ring, a membrane, an electrode, a synthetic resin insulating block and a base plate with integrated preamplifier and external circuit components. The block (11) is pressed into the housing (1) and slides axially inside it. The external circuit components (9) are embedded in the block, which is pressed against the inner end ring by a plate that screws into the housing.