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Voice Control Music Doorbell Circuit

2015-02-04 21:38  
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Voice Control Music Doorbell Circuit
This voice control music doorbell circuit uses two integrated circuit, a 3V battery to supply. Its static consumption current is about 100uA which would be tens of mA while playing the sound.The circuit's working principle is below:The circuit is shown in the picture below. NE555 is working in monostable mode. The trigger-port 2 foot's DC voltage is set a little higher than one third of Vdd. When there is door-knocking sound or other sound, TC would generate voltage to trigger NE555's 3 foot to output high voltage which has been inverted. Then it would trigger the music integrated circuit. So after the buffering in 9013 the music signal would drive the speaker to play music. When static, NE555's consumption current is just tens of mA, and other components' consumption current is just several uA.The debug method is shown below:This circuit is easily to install and needn't debugging in normal conditions. If the components are all good, the circuit would work by connecting these components. If the user wants to increase the sensitivity of voice control, he can adjust the partial voltage of the NE555's 2 foot and by changing this voltage it could achieve the goal. The nearer 2 foot's voltage is to the one third of Vdd, the more sensitivity the voice control has. But, if the sensitivity is too high, well the circuit would work if there is a little sound. Also the NE555's 2 foot's voltage can be a little various in different time and temperature which may cause the circuit going wrong or disable.