Human reaction speed tester

Published:2012/12/3 21:13:00 Author:Ecco | Keyword: Human reaction , speed tester | From:SeekIC

NAND gate D25, D26 form multivibrator which outputs the clock pulse with approximately 50ms cycle. IC1 can form an 8 - bit right shift register, and D1 forms a starting up delay circuit output, of which signal is used as its serial input data. When the machine starts, since D1 output is 1 , under the effect of clock pulses, IC1's all 8-bit Storage units quickly become 1 , after 3s ~~ 4s, D1 output becomes 0 , then tested light VD1 is lit.



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