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Scans-00145149.pdf
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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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ECAD Model
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12 Mhz in crystal oscillator
18-PIN
DTMF telephone
LM 941
LR4089
LR4089B
LR4089BN
sine wave inverter circuit diagram