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Partial File Text ï»¿SHARP LR4089B/ LR4089BN LR4089B/LR4089BN Tone Dialer LSI DESCRIPTION The LR4089B/LR4089BN are monolithic tone dialer LSI that uses an inexpensive crystal reference to provide eight audio sinus
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12 Mhz in crystal oscillator 18-PIN DTMF telephone LM 941 LR4089 LR4089B LR4089BN sine wave inverter circuit diagram

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