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FDD400-1 and JDD400-1 form a digital wireless paging system
Source: InternetPublisher:qoistoochee128 Updated: 2019/07/24
Relevant key device information applied in this article:
MK5087
FD400
7806
ANTD0
YN9101
CD4511
CD4011
HFC9301
encoding transmitter circuit (MK5087 is a DTMF encoder):
receiving decoding circuit (YN9101 is a DTMF decoder, HFC9301 is a warning tone generating circuit, LM386 is Audio amplifier circuit)
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