555 acute coronary artery blood-supply insufficiency alarm circuit

Published:2011/5/24 2:54:00 Author:TaoXi | Keyword: acute coronary artery, blood-supply, insufficiency, alarm circuit | From:SeekIC

The acute or chronic myocardial infarction disease's omen is the acute coronary artery blood-supply insufficiency, and the heart waves obvious variation. The principle of the alarm circuit: changes the amplitude variation into the width variation. In the circuit, the IC1 is the monostable trigger, the timing time t2=1 minute; IC2 is the monostable trigger, the timing time t3=2 minutes; it controls the on-off of the IC9 and IC10 alarm circuit's power supply voltage. IC9 is the low frequency astable multivibrator, it produces the 1Hz square-wave signal to control the multivibrator (the oscillation frequency is 1000Hz) IC10's control port pin-5 to produce the variable tones audio alarm signal.



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