Heart Rhythm Tester (the 4th)

Published:2011/6/23 21:40:00 Author:Felicity | Keyword: Heart Rhythm Tester (the 4th) | From:SeekIC

Work of the circuit The circuit consists of photo electricity testing circuit, signal amplifying circuit, buzzer driving circuit and current indicating circuit. (It is shows in picture 9-56.) When you do the test, put your finger between EL and RG. Some lights of EL go through the finger and shines on RG. RG produces sensitive signal. The signal is amplified by N1-N3 and separates into two parts. One drive HA makes the buzzer work. And the other one goes through ammeter and indicates the current value. The current value increases by the rate of heart beating. Change the value of RP1 to change the accuracy. Change the value of RP2 to change the testing scope.



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