The voice distress box of patient faintness

Published:2011/6/3 23:47:00 Author:Seven | Keyword: voice distress box, patient faintness | From:SeekIC

In the figure, the carriage switch SK can be used in mercury switches in the market and self-made mercury or salty water switches, see as figure a. SK is used to test the state of the taker: when it is still, as it is put vertically, the two electric poles are insulated; when the people are moving, the two poles are on and off now and then, which makes VT1 and VT2 conducting and blocked now and then. Therefore, the CI, which is linked with VT2 pole, charges and discharges now and then, but the voltage on C1 can reach 1.3v all the time which is lower than the offset triggering LEV of 1/3 VDD(2v) of the time-based circuit(555).



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