Ward Caller Eight

Published:2011/7/17 0:46:00 Author:Felicity | Keyword: Ward Caller | From:SeekIC

This ward caller is consists of calling-control circuit and music circuit. Aalling-control circuit consists of callswitchesSl-S4,resistorsR1-R4,light-emitting diodesVLl-VL4anddiodeVDl-VD4. Music circuit consists of resistorR5,transistorV,musicintegrated circuitIC andspeaker BL . When one of the call switches S1-S4 is pressed, the IC is triggered on to work, the music electrical signal output by O/P is amplified by V to drive BL to send out music sound; at the same time the LED in this branch is on to indicate the bed number of the patient. After the medical personnel receives the acousto-optic calling signal, they reset S2 and press the reset button S0 to make IC reset and BL stops. Only four calling circuitsare showed in the figure and the number of it can be adjusted according to actual need.



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