DSA0037994.pdf by Atmel

Partial File Text U4030B Telephone Speech Circuit Description The U4030B is an electronic speech circuit for standard and feature telephones. It replaces the hybrid transformer, earphone and microphone interface a
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atmel cordless telephone CVD 68 DIP20 IC 4030 pin diagram NF 430 n a3 U4030B U4030B-AFL U4030B-AFLG3 wireless protection using dtmf