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Partial File Text ï»¿ERICSSON 9 September 1989 PBL 3781, PPB 3781/02 Low Voltage Speech Circuit Description The PBL 3781 and PBL 3781/02 are bipolar integrated speech circuits for use in electronic telephones. The c
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1N4004 891033 dynamic microphone FET electret microphone sidetone cancellation