Visual doorbell circuit 2

Published:2011/8/17 21:30:00 Author:Jessie | Keyword: Visual doorbell | From:SeekIC

Figure shows the 315MHz code receiving signal demodulation and controlling circuit. 315MHz code signal is sent to CD4069 for shanping and amplification after high amplification and superregeneration demodulation, then the PT2272 decoding outputs a high level to trigger the music IC to issue the ding-dong, ding-dong doorbell. Meanwhile, the ring signal can turn on the control circuit, then relay J makes action, and the total powerof TV works. The control circuit also has a delay circuit, and after about 55 seconds, the relay releases, the total power of TV is turned off, then it will be in the re-standby state. Note: the address code of the PT2272 decoding block must be the same with encoding block PT2262.



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