Automatic help alarm medicine box control circuit
Source: InternetPublisher:兰博 Keywords: control circuit switch alarm circuit Updated: 2020/01/14
Working principle of the circuit: When the patient is upright, the mercury switch SQ installed in the medicine box
is in the off state, and the alarm circuit does not work when the power is turned off. Once the patient falls, SQ automatically turns on
the circuit power, and GB charges C through RT. After a few seconds, the charging voltage at both ends of C reaches
about 1.3 V, VD and VT. It turns from cut-off to conduction successively. IC works because pin 7 receives a
low-level trigger signal . Its output pin 6 outputs pulse
signals with three frequency transformations . After being amplified by VT2 power, it drives B to emit a pleasant tone-changing alarm sound. .
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