Piezoelectric MEMS Two Microphone Slider Evaluation Board Data Sheet PMM-3738-VM1000-EB-2-R PUI Audio, featuring Vespers exclusive technology, presents the PMM-3738- VM1000-EB-2-R two-microphone slider evaluation board. This evaluation board is designed to quickly allow users to connect two PMM-3738- VM1000-R microphones directly into a Plug-In Power, two-wire microphone interface. The spacing of the microphones can be varied from 10mm up to 120mm, for stereo recording or for creating a microphone array. Evaluation Board Features: Two PMM-3738-VM1000-R piezoelectric MEMS microphones on moveable PCBs Slider stand with mounting flanges and an integrated ruler for setting microphone spacing Built-in two-wire conversion circuits and three-pole 3.5mm plug for quick connection PMM-3738-VM1000-R Features: Very-low microphone noise floor and high dynamic range Stable performance in all conditions dust and water resistant to IP57 Stiction immunity and ultra-fast startup <100S PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414 Tel: (937) 415-5901 Fax: (937) 415-5925 Setup The built-in 3.5mm plug is wired to each microphone for left and right channel recording and connects directly to any system with a Plug-In Power interface, such as found on the Conexant CX20921 AVS two-mic evaluation system and the Zoom H1 Audio Recorder. Microphone Slider Operation Each mini microphone PCB assembly is a unique combination of flex and solid PCBs to hold the microphones in-place when in the mic slider stand channel, while allowing the user to easily adjust the microphone spacing distance. On each of the mini PCBs, there are three solid PCBs connected together by two flex circuits. The two outer solid PCBs act as adjustment wings. The center solid PCB is where the microphone is mounted. Solid and Flex circuits Intended slider operation To move the mics in the slider channel the user grabs each mic by the PCB wings on either side of the mic. By pinching the tabs together, the user reduces the tension between the boards which holds it in place in the slider channel, allowing it to slide side-to-side. The user should not try to move the mini PCB assemblies by pulling on only one wing, as the tension will not be reduced and the flex circuit could tear with excessive strain. PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414 Tel: (937) 415-5901 Fax: (937) 415-5925