hobby-games-modelling
Quiz-type game shows are increasingly popular on television. In these games, fastest finger first indicators (FFFIs) are utilized to assess players' reaction times. When a player presses their designated entry button, their number is displayed along with an audio alarm. The circuit described determines which of the four contestants pressed the button first and locks out the remaining entries. Simultaneously, an audio alarm and the corresponding contestant's decimal number display are activated. When a contestant presses their switch, the output of latch IC2 (7475) changes its logic state from 1 to 0. The combinational circuitry, consisting of dual 4-input NAND gates from IC3 (7420), locks out subsequent entries by producing the appropriate latch-disable signal. Priority encoder IC4 (74147) encodes the active-low input condition into the corresponding binary-coded decimal (BCD) number output. The outputs of IC4, after being inverted by inverter gates within hex inverter 74LS04 (IC5), are connected to the BCD-to-7-segment decoder/display driver IC6 (7447). The output of IC6 drives a common-anode 7-segment LED display (DIS. 1, FND507 or LT542). The audio alarm generator consists of clock oscillator IC7 (555), whose output drives a loudspeaker. The oscillator frequency can be adjusted using preset VR1. A logic 0 state at one of the outputs of IC2 produces a logic 1 input condition at pin 4 of IC7, enabling the audio oscillator. IC7 requires a +12V DC supply for adequate alarm volume. The rest of the circuit operates on a regulated +5V DC supply, provided by IC1 (7805). Once the organizer identifies the contestant who pressed the switch first, they can disable the audio alarm and reset the digital display to 0 by pressing reset pushbutton S5. With slight modifications, this circuit can be adapted to accommodate more than four contestants.
The circuit for the quiz-type game show operates on a systematic approach to determine which contestant reacts the fastest. The core of the design is based on a combination of digital logic components that facilitate the detection, display, and audio signaling of the contestant's response.
The fastest finger first indicator (FFFI) utilizes a latch IC (7475) to capture the first button press. Each contestant has a dedicated button that, when pressed, changes the latch's output state, indicating that the contestant has entered. The dual 4-input NAND gates (7420) play a critical role in ensuring that once a contestant has been acknowledged, the system locks out any further entries, preventing any subsequent button presses from being registered.
The priority encoder (74147) converts the active low signal from the latch into a binary-coded decimal (BCD) output, which is crucial for the display function. The BCD output is then processed by a BCD-to-7-segment decoder (7447), which drives a common-anode 7-segment LED display, providing a clear visual indication of the contestant's number.
The audio alarm component is managed by a 555 timer configured as an oscillator. The frequency of the audio output can be adjusted via a variable resistor (VR1), allowing the sound level to be customized based on the environment or requirements of the game show. The audio alarm is activated when the latch output indicates a contestant's press, sending a signal to the oscillator, which in turn drives a loudspeaker.
Power supply considerations are addressed with a dual voltage setup: the audio alarm requires a +12V DC supply for optimal performance, while the logic components operate on a regulated +5V DC supply sourced from a voltage regulator (7805). This separation ensures that the digital logic circuitry operates reliably without interference from the audio components.
The reset functionality, provided by pushbutton S5, allows the organizer to clear the display and silence the alarm after identifying the winning contestant. This circuit design is versatile and can be modified to accommodate a greater number of contestants, enhancing its applicability in various game show formats.Quiz-type game shows are increasingly becoming popular on television these days. In such games, fastest finger first indicators (FFFIs) are used to test the player`s reaction time. The player`s designated number is displayed with an audio alarm when the player presses his entry button. The circuit presented here determines as to which of the four contestants first pressed the button and locks out the remaining three entries. Simultaneously, an audio alarm and the correct decimal number display of the corresponding contestant are activated. When a contestant presses his switch, the corresponding output of latch IC2 (7475) changes its logic state from 1 to 0.
The combinational circuitry comprising dual 4-input NAND gates of IC3 (7420) locks out subsequent entries by producing the appropriate latch-disable signal. Priority encoder IC4 (74147) encodes the active-low input condition into the corresponding binary coded decimal (BCD) number output.
The outputs of IC4 after inversion by inverter gates inside hex inverter 74LS04 (IC5) are coupled to BCD-to-7-segment decoder/display driver IC6 (7447). The output of IC6 drives common-anode 7-segment LED display (DIS. 1, FND507 or LT542). The audio alarm generator comprises clock oscillator IC7 (555), whose output drives a loudspeaker. The oscillator frequency can be varied with the help of preset VR1. Logic 0 state at one of the outputs of IC2 produces logic 1 input condition at pin 4 of IC7, thereby enabling the audio oscillator.
IC7 needs +12V DC supply for sufficient alarm level. The remaining circuit operates on regulated +5V DC supply, which is obtained using IC1 (7805). Once the organiser identifies the contestant who pressed the switch first, he disables the audio alarm and at the same time forces the digital display to 0` by pressing reset pushbutton S5. With a slight modification, this circuit can accommodate more than four contestants. 🔗 External reference
The circuit for the quiz-type game show operates on a systematic approach to determine which contestant reacts the fastest. The core of the design is based on a combination of digital logic components that facilitate the detection, display, and audio signaling of the contestant's response.
The fastest finger first indicator (FFFI) utilizes a latch IC (7475) to capture the first button press. Each contestant has a dedicated button that, when pressed, changes the latch's output state, indicating that the contestant has entered. The dual 4-input NAND gates (7420) play a critical role in ensuring that once a contestant has been acknowledged, the system locks out any further entries, preventing any subsequent button presses from being registered.
The priority encoder (74147) converts the active low signal from the latch into a binary-coded decimal (BCD) output, which is crucial for the display function. The BCD output is then processed by a BCD-to-7-segment decoder (7447), which drives a common-anode 7-segment LED display, providing a clear visual indication of the contestant's number.
The audio alarm component is managed by a 555 timer configured as an oscillator. The frequency of the audio output can be adjusted via a variable resistor (VR1), allowing the sound level to be customized based on the environment or requirements of the game show. The audio alarm is activated when the latch output indicates a contestant's press, sending a signal to the oscillator, which in turn drives a loudspeaker.
Power supply considerations are addressed with a dual voltage setup: the audio alarm requires a +12V DC supply for optimal performance, while the logic components operate on a regulated +5V DC supply sourced from a voltage regulator (7805). This separation ensures that the digital logic circuitry operates reliably without interference from the audio components.
The reset functionality, provided by pushbutton S5, allows the organizer to clear the display and silence the alarm after identifying the winning contestant. This circuit design is versatile and can be modified to accommodate a greater number of contestants, enhancing its applicability in various game show formats.Quiz-type game shows are increasingly becoming popular on television these days. In such games, fastest finger first indicators (FFFIs) are used to test the player`s reaction time. The player`s designated number is displayed with an audio alarm when the player presses his entry button. The circuit presented here determines as to which of the four contestants first pressed the button and locks out the remaining three entries. Simultaneously, an audio alarm and the correct decimal number display of the corresponding contestant are activated. When a contestant presses his switch, the corresponding output of latch IC2 (7475) changes its logic state from 1 to 0.
The combinational circuitry comprising dual 4-input NAND gates of IC3 (7420) locks out subsequent entries by producing the appropriate latch-disable signal. Priority encoder IC4 (74147) encodes the active-low input condition into the corresponding binary coded decimal (BCD) number output.
The outputs of IC4 after inversion by inverter gates inside hex inverter 74LS04 (IC5) are coupled to BCD-to-7-segment decoder/display driver IC6 (7447). The output of IC6 drives common-anode 7-segment LED display (DIS. 1, FND507 or LT542). The audio alarm generator comprises clock oscillator IC7 (555), whose output drives a loudspeaker. The oscillator frequency can be varied with the help of preset VR1. Logic 0 state at one of the outputs of IC2 produces logic 1 input condition at pin 4 of IC7, thereby enabling the audio oscillator.
IC7 needs +12V DC supply for sufficient alarm level. The remaining circuit operates on regulated +5V DC supply, which is obtained using IC1 (7805). Once the organiser identifies the contestant who pressed the switch first, he disables the audio alarm and at the same time forces the digital display to 0` by pressing reset pushbutton S5. With a slight modification, this circuit can accommodate more than four contestants. 🔗 External reference