Mini rhythm tester circuit diagram

Published:2011/9/7 3:11:00 Author:Lucas | Keyword: Mini rhythm tester | From:SeekIC

HTD receives heart beat signal, then it is amplified by F1, F2. R4, C3 are used to filter out high frequency signal, then it is input F7 afeter amplifing by F3, F4, shaping by F5, F6. F7 and the peripheral circuitform the monostable circuit, so it gets positive pulse signal with the frequency being the same with heart rate at the F8 output end ( pulse width is 40ms). DW, RP, V, P form the constant current circuit, and it will get a pulse current in P of the meter, then it is integrated by C8 to make the faster heart rate and greater P display. In the contrary, the rate and display is smaller.



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