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
Click here to download the full size of the above Circuit.

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.

Leave Comment

characters left:

New Circuits



Popular Circuits

Guitar OmniDrive effect
Musical telephone ringer
3v fm transmitters circuit diagram
Geerts clock
microcontroller complete code midi emulated ps 2 keyboard
Balanced Low Noise Microphone Preamp
The General Electric XT-1-A AM transmitter
Clarinet Vacuum Tube Linestage
Handheld Oscilloscope Oscillator Circuit
Electro Harmonix drum sequencer
slow down a fuel pump
Ultrasonic anemometer Ultrasonic wind sensor
3 Band Graphic Equalizer
Electronics - circuit relay type answer
Way operation dynamic braking circuit 2