The basic die circuit is given. A 555 timer, ICl, is connected as an astable multivibrator. This feeds clock pulses to divide-by-six counter IC2 tbe outputs of which are decoded by gates Nl to N6 to drive an array of LEDs in the familiar die pattern. When switch Sl is in position b, tbe reset input of IC1 decreases and the oscillator is inhibited. Power is fed to the LEDs via Slb so that the display is activated. When the die is rolled by switching Sl to position a, tbe display is blanked. C4 is connected to positive supply via Sla, producing a short pulse which resets IC2 via N7 and N8.
Electronic-dice - schematic

The reset input of IC1 is pulled high via R5, so tbe multivibrator begins to oscillate and feeds clock pulses to IC2 via N5. When Sl is switched back to position a, tbe multivibrator is again inhibited. Then, the counter stops and power is applied to the LEDs which display tbe value of tbe throw.

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