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Transcript
14 Reaction Timer The circuit below can be used to test a person’s reaction time to a precision of ±0·01 seconds. The time is indicated by a series of seven leds showing the output of a binary counter (4060). The two D type flip-flops are in a 4013. The led shown on the circuit diagram is the “stimulus”. Switch S1 starts the timer and illuminates the stimulus led. Switch S2 stops the timer. 7805 +9v 10k 100k 1k Q D cl S2 cl Q rst 100n - S1 set rst Q 11 1M 1M Q D 10 9 1n5 100k 12 15 13 14 6 4 5 7 to leds 1k - 1 To calibrate the timer 1. Remove the 4013 from its holder; this allows the oscillator in the 4060 to run continuously. 2. Connect the battery and then connect an oscilloscope across the first led (that is, the led which is connected to pin 7 of the 4060). 3. Adjust the variable resistor to produce an oscillation of time period 10ms. © David Hoult 2001 2