Electronic Dice Circuit Diagram


An electronic dice is a classic first project for those getting
interested in electronics. A timer, counter and a few LEDs makes a
circuit that can also add a new twist to some old boring board games.
When the switch is pressed, a 555 timer in astable mode pulses a BCD
counter which lights up a series of LEDs wired to mimic a dice. Two AND
gates are used to reset the count back to one whenever the BCD output is
seven. Thus, the circuit is not truly random but the natural bounce
present in a pushbutton and the normal human ability to operate much
slower then the oscillator make the output of the circuit seem random.

Schematic

Schematic for the Electronic Dice Circuit

Parts

Part
Total Qty.
Description
Substitutions
R1, R5, R6 3 22K 1/4W Resistor
R2 1 10K 1/4W Resistor
R3 1 4.7K 1/4W Resistor
R4 1 150K 1/4W Resistor
R7 – R13 7 330 Ohm 1/4W Resistor
C1 1 1uF Electrolytic Capacitor
C2 1 4.7uF Electrolytic Capacitor
D1 1 1N4148 Signal Diode
D2 – D8 7 Red/Green/Yellow LED
Q1 1 2N3904 NPN Transistor
U1 1 555 Timer IC
U2 1 74LS192 4 Bit Counter IC
U3 1 74LS08 Quad Intengreted AND Gate IC
S1 1 SPST Momentary Pushbutton Switch
MISC 1 Board, Wire, Sockets For ICs, Case

Notes

  1. Pushing and holding S1 causes the LEDs to rapidly cycle. Releasing the button locks the pattern and shows a number from 1 to 6.
  2. When building the circuit, make sure to position the LEDs as
    shown on the schematic. Otherwise the pattern of the dice will look
    weird.
  3. Two circuits can of course be both powered by one switch to make a dual dice.

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