Buy Electret Cardiod Microphone Boom And Capsule Requirements for the electret cardiod microphone boom and capsule 1. The boom consists of a flexible tube part, microphone head part, electret microphone element, coaxial shielded insulator coated 1-wire cable and a 3. 5-inch stereo type jack. 2. The electrical connection drawing is shown below in appendix 1. 3. Tube color should be (in this order of preference) silver, grey or eventually black 4. Tube shall be compliant to the European rohs directive. 5. Total tube length shall be within the range from 20 up to 35 cm, tube diameter in the base not exceed 6. 5 mm, total weight not exceed 200 grams. 6. The microphone should ideally have the following or most similar characteristics: 1) unidireactional 2) noise-cancelling (frequency cutoff of frequencies above 12khz and lower than 100 hz) 3) sensitivity: -38dbv / pa or better--under conditions 5) and 6) hereunder 4) working frequency: 200-12000 khz with irregularity + / -6 db or less. 5) equivalent impedance (rl) : 1kohm or less. 6) supply voltage: 2. 0 v 7. The microphone head shall contain insulation material for sound attenuation from directions that are not concurrent with microphone direction. 8. The length of coaxial cable, excluding the length of microphone head and length of 3. 5-inch connector, should be calculated as tube length, added with 14-16 cm company name:Speechware address:Sq. Ambiorix 30, Bte 61, 5th Floor, Brussels, Belgium, Belgium tel:32-2-7331688 fax:32-2-7331687 cellphone: contact person:Mr. JM Boccio zipcode:1000 website:http://www.speechware.be E-mail:
