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    carbon microphone

    Abstract: al24
    Text: KEYPAD CONTROLLED SINGLE-CHIP TELEPHONE IC LB1008AE PRELIMINARY Description The LB1008AE integrated circuit requires only a few external components see Figure 19 to provide all of the touch-tone electronic functions. This integrated circuit furnishes ac and dc loop termination for both switchhook states, transmits


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    PDF LB1008AE LB1008AE carbon microphone al24