Published:2011/4/15 1:08:00 Author:Rebekka | Keyword: digital wireless bleep system | From:SeekIC
Coded transmitting circuit(MK5087 is the DTMF encoder):
Receiver decoder circuit (YN9101 is the DTMF decoder. HFC9301 is warning sound generating circuit. LM386 is the audio amplifier circuit).
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