555 patient faint language alarm box circuit

Published:2011/5/25 3:47:00 Author:TaoXi | Keyword: 555, patient, faint, language alarm, box | From:SeekIC

The language alarm box is composed of the posture switch, the oscillating circuit and the language alarm circuit, as the figure 16-43 shows. The astable multivibrator is composed of the IC1(555) and R3，R4，C2.etc. In the peace time, C2's voltage is lower than 1/3VDD, this makes the 555 in the setting state; when the patient falls down, SK makes the VT1 in the saturated conduction state, VT2 cuts off, C2's charging voltage is higher than 2V to make the D1 to cuts off. The IC2 uses the language integrated circuit IVR1601, this chip is composed of the clock circuit, the logic control circuit, the trigger circuit, the language read-only memory (ROM) and the driver.etc.



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