FIELD: electroacoustics. SUBSTANCE: microphone unit includes microphone 1, eight capacitors 3, 4, 8, 10, 12, 13, 14, 15, nine resistors 5, 6, 9, 11, 16, 17, 18, 19, 20, variable resistor 7, two operational amplifiers 23, 24, common wire 2, output wire 21 and supply wire 22. Operational amplifiers, resistors, capacitors and variable resistor are placed between microphone and output wire. EFFECT: simplified design, improved efficiency. 1 dwg
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