@▷ Electronic Dice Circuit | Diagram for Schematic

Electronic Dice Circuit

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, R6322K 1/4W Resistor
R2110K 1/4W Resistor
R314.7K 1/4W Resistor
R41150K 1/4W Resistor
R7 - R137330 Ohm 1/4W Resistor
C111uF Electrolytic Capacitor
C214.7uF Electrolytic Capacitor
D111N4148 Signal Diode
D2 - D87Red/Green/Yellow LED
Q112N3904 NPN Transistor
U11555 Timer IC
U2174LS192 4 Bit Counter IC
U3174LS08 Quad Intengreted AND Gate IC
S11SPST Momentary Pushbutton Switch
MISC1Board, 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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