REACTION TIMER GAME Circuit
This is a game for two players.
Player 1 presses the
START button. This resets the 4026
counter chip and starts the 555 oscillator.
The 555 produces 10 pulses per second and these are counted by the
4026 chip and displayed on the 7-Segment display.
The second player is required to press the
STOP button. This
freezes the display by activating the
Clock Inhibit line of the
4026 (pin 2).
Two time-delay circuits are included. The first activates the 555 by
charging a 10u electrolytic and at the same time delivering a (high) pulse
to the 4026 chip to reset it. The second timer freezes the count on
the display (by raising the voltage on pin 2) so it can be read.
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