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ScansU9X13246.pdf
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HDLTEK HT9201A/B Simple Tone Dialer Features Patent Number: 113235(R.O.C.), 5424740(U.S.A.) Operating voltage: 2.0V~5.5V Low standby current 4x4 keyboard matrix 3.58MHz crystal or ceramic resonator F
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16 key 4x4 DTMF
4x4 keyboard
for 4x4 keyboard
HT9201A
keyboard matrix 4x4
keyboard to DTMF
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