reaction tester - with variable waiting time

reaction tester elektor march 1983 Strictly speaking, this circuit is too good for a "mere game", although it can certainly be a lot of fun. The reaction time is indicated to within one tenth of a millisecond on a 4-digit display, and the circuit can also evaluate the difference between the reaction times of two persons and indicate which one pressed his button first. reaction tester with variable waiting time Not only do reaction testers provide a lot of fun for all ages, they can also be used for more serious applications (testing a driver"s reactions, say, or an athlete"s reflexes). The unit is simple to operate: once the start button has been pressed there is a delay period until a LED lights up. The challenge then is to press a button as quickly as possible. The elapsed time (between the LED lighting up and the button being hit) is measured, and indicated as reaction time in milliseconds on a 4-digit display. It is also possible for two people to compare their reaction times....