555 fall means a circuit diagram for help


Posted on Mar 28, 2007

As shown, the call falls by the position sensing circuit trigger control circuit and SOS alarm circuit. For critically ill patients or for help with a disabled person falls. Pa


555 fall means a circuit diagram for help
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tients with chest pocket position sensor placed inside the box with a mercury switch, horizontal. When the fall, A, B two contacts are electrically conductive mercury ON, C1 immediately charged, VT1 conduction, J1 pull, the power supply circuit is turned on the sound, so the sound rang for help. IC1 and R1, RP1, C1 composition astable multivibrator oscillation period transferred to T 1 second. Charging and discharging the capacitor C1 to form a triangular wave VT1, the emitter follower output added to the controllable multivibrator IC2, the IC2 with the change in control voltage issued a similar message called an ambulance sound.




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