Roulette with LED Display

This circuit is a small digital roulette. It is constituted by oscillator IC1, the counter IC2, the transistors Q1-7 that drive the display common cathode DSP1. The supply basically becomes from a battery 9V, but can become also from one power supply. The regulation of frequency should become in the 10Hz or little bigger, with the potentiometer TR1 combination with the C1, which we can change the capacity, changing thus and the frequency of oscillator. Bigger frequency means faster speed in rolling the indicate in the display. With the TR2 we alter the time where will last the measurement, afterwards the release of S1. With the S2 we make RESET in the display. With the S1, we make departure in the circuit and simultaneously RESET, when start after a circle. When we release the S1, the meter stops in number, then it should we press again the S1, so that begins new circle of game or we make nihilism via the S2. If comes zero then the player that makes "mother," it can take all the profits, from all the other players. In the game they can take part, from two up to nine players. The TR1-2 can be in form trimmer or potentiometer, proportionally what us accommodates. R1= 10Kohms Q1-8= BC550 TR1= 470Kohms trim. or pot. lin R2-9= 1Kohms DSP1= Display 7 segment common cathode TR2= 100Kohms trim. or pot. lin C1= 0.47 until 2.2uF 16V IC1= 4011 S1= 1/2 Switch C2= 100uF 16V IC2= 4026 S2-3= Push Button normal open C3= 47uF 16V D1-2= 1N4148 BATT= 9V Battery or ext. supply

This circuit functions as a digital roulette game designed for up to nine players. The core components include an oscillator (IC1) and a counter (IC2), which work in tandem to produce the game's random number generation. The oscillator is responsible for generating a frequency that dictates the speed of the roulette display, adjustable via the potentiometer TR1 in combination with the capacitor C1. The frequency can be set between approximately 10 Hz and higher, where a higher frequency results in a faster display rotation.

The display used is a common cathode 7-segment display (DSP1), which is driven by transistors Q1 to Q7. These transistors serve to control the segments of the display based on the output from the counter IC2. The counter IC2 (4026) counts the pulses generated by the oscillator, translating them into a readable format on the display.

Powering the circuit can be achieved through a 9V battery or an external power supply. Capacitors C2 and C3 are used for power supply decoupling, ensuring stable operation of the circuit by filtering out any high-frequency noise.

User interaction is facilitated through switches S1 and S2. The S1 switch serves a dual purpose: it initiates the game by starting the oscillator and simultaneously resets the display. Upon releasing S1, the display will stop at a random number, indicating the outcome of the game. If the player wishes to start a new round, they must press S1 again. Alternatively, S2 is utilized to reset the display at any time.

The circuit also includes a mechanism for determining the winner. If the display shows a zero, the player designated as "mother" collects all the winnings from the other players. The game is designed to be simple yet engaging, making it suitable for casual play among friends or at gatherings.

Resistor values include R1 at 10 kΩ and R2 through R9 at 1 kΩ. The trimmer potentiometers, TR1 and TR2, are set at 470 kΩ and 100 kΩ, respectively, allowing for fine adjustments to the frequency and timing of the game. The diodes D1 and D2 (1N4148) are included for protection against reverse polarity and to ensure proper operation of the circuit. This circuit is a small digital ?roulette''. It is constituted by oscillator IC1, the counter IC2, the transistors Q1-7 that drive the display common cathode DSP1. The supply basically becomes from a battery 9V, but can become also from one power supply. The regulation of frequency should become in the 10HZ or little bigger, with to pontesometer TR1 combination with the C1, which we can change the capacity, changing thus and the frequency of oscillator.

Bigger frequency means faster speed in ??rolling?? the indicate in the display. M? the TR2 we alter the time where will last the measurement, afterwards the release of S1. With the S2 we make RESET in the display. With the S1, we make departure in the circuit and simultaneously RESET, when start after a circle. When we release the S1, the meter stops in number, then it should we press again the S1, so that begins new circle of game or we make nihilism via the S2. If comes zero then the player that makes '' mother '', it can take all the '' profits, from all the other players.

In the game they can take part, from two up to nine players. The TR1-2 can be in form trimmer or potentiometer, proportionally what us accomodates. R1= 10Kohms Q1-8= BC550 TR1= 470Kohms trim. or pot. lin R2-9= 1Kohms DSP1= Display 7 segment common cathode TR2= 100Kohms trim. or pot. lin C1= 0.47 until 2.2uF 16V IC1= 4011 S1= 1?2 Switch C2= 100uF 16V IC2= 4026 S2-3= Push Button normal open C3= 47uF 16V D1-2= 1N4148 BATT= 9V Battery ?r ext. supply 🔗 External reference