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Partial File Text ï»¿UIVIO UM9151 Pulse Dialer Ã5Ã Features â Direct telephone line operation â 4x3 matrix single contact keyboard â Supply voltage range 2.5V to 5V â Inexpensive RC oscillator â Low
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2N5401 2N5551 600pps anti-bounce Telephone Dialer Circuit MEMORY telephone handset circuit UM9151 UM9151 tone