any info/schema regarding: "quiz show game" circuit

[RaffT]

 mga bro,

 any links/schema about:

 circuit like the "quiz show game" circuit.... like yung circuit nya mag buzz o iilaw if a certain contestant pushes his/her button(the 1st one who presses)..parang ganun, when the other contestants press, d na pwede kasi may nauna na...

 I want a similar one pero hindi sya mag "lock" , parang pag nag press ng "1", it will stay at"1", IF I press "5", mag lock naman ng "5"...if "3", then lock on "3"..parang ganun.. been doing this sa j-k flipflop, ok lang pag dalawa PERO d ko na magets if I need more than 2 switches na...

anyone got the idea?? madali ito sa PIC pero gusto ko logic gate based (or SCR)... anyone?

['yus]

ito na-try na namin nung college, pero hindi 'to pasok dun sa 2nd requirement mo.
baka pwede naman sigurong i-modify:

Game Show Timers

[RaffT]

 tnx bro.. dami din ako nakita mga game show circuit na ganyan, SCR based... ok na sana sa logic gates , kaso hirap na pano paramihin input switches.... na pag pindot mo sa "1" eh RESET ang iba(2,3,4,5) except "1"...

['yus]

I want a similar one pero hindi sya mag "lock" , parang pag nag press ng "1", it will stay at"1", IF I press "5", mag lock naman ng "5"...if "3", then lock on "3"..parang ganun.. been doing this sa j-k flipflop, ok lang pag dalawa PERO d ko na magets if I need more than 2 switches na...

nalilito pa rin ako sa "lock" sequence nito.. accdg sa first statement: "pero hindi sya mag lock" ?

[RaffT]

ok rephase...

 when I press "1", it WILL latch on "1" output(and will NOT lock other outputs 2,3,4,5)... and If I press another, like "4", it will latch on to "4" output... I hope clear na.. hehe

[ahlburuto]

pwede ba relay logic? di kasi ako magaling sa mga gates eh, pero relay logic magagawa ko yan. pwede ba?

BR

[ahlburuto]

parang mas maganda ata kung meron kang master reset. kasi kung ganun ang logic mo eh parang di applicable kung sa games mo gagamitin kasi kung unahan ng pindot ang principle eh halimbawang nauna sa 1, tapus biglang pumindot si 2, di sya naman naka latch? mas ok siguro kung, pag nauna si 1 eh mag latch sya pero di makakapindot si 2,3,4,5 hanggat di pinipindot yung reset button(for the 2nd question or round). or pwede rin naman na off delay timer ang de latching.

Teka anu ba application mo?

BR

[motion55]

Try the following circuit.



If any one of switches is pressed, the output of 74HC30 ( pin 8 ) goes HIGH. The retriggerable monostable multivibrator is triggered and the output at pin 4 goes LOW. This signal is input into the strobe pin of the transparent latch which "remembers" who pressed the button first and locks out all others. The multivibrator's delay also serves to debounce the switches by locking out even the switch that was pressed for a minimum debounce time.
 

[HK-47]

OT: Please change the thread title to reflect the topic. Thread titles like that can make browsing through forums confusing.

[RaffT]

 ahlburuto,
 para sa anung application? secret! basta indi games based.. more on guitar effects ok rin may master reset pra after power ON, walang iilaw kahit isa sa mga output/s...

motion55,
tnx bro...gawa mo yan sa sim?? if gumana sa sim eh di OK na yan... try ko muna ito sa sim...ewan kung meron 8 input NAND dito sa leyte...

cge brb try ko to sa sim ko...

[ahlburuto]

 mukhang naiisip ko na yung application mu ah.... hehhehe.... parang nakikita ko eh mga pedals yun ah....

BR

[RaffT]

ahlburuto,

 nice

@motion55,

 anu sim gamit mo?? la kasi ako makita 74HC123 sa multisim8 ver8.3.30...sayang di ko masimulate...

EDIT:

 ok I read the whole context.. used as delay lang pla 74xx123.. hehe mano mano delay nalang gawin ko dito para sa sim..

[RaffT]

 whew..ayaw gumana sa SIM ko.. tsk...

 

[rdpzycho]

OT: relay logic specialist ka rin pala ahlburuto. 'yan din laging gamit ng tatay ko. nakakatuwang pakinggan yung clicks ng relay, kita mo kaagad kung saan merong mali yung logic mo.

[motion55]

@rafft

No I did not simulate the circuit. I think it's your turn to do that if you feel you have to.

Anyway, here is another version which uses diodes instead of the 74HC30 and a simple RC circuit instead of the 74HC123. There is a small time window where two buttons pressed almost at the same time that will turn ON their respective LEDs. The window is a few usec wide and so highly unlikely to happen.

[RaffT]

 ok.. many thanks motion55

 

[ahlburuto]

OT: relay logic specialist ka rin pala ahlburuto. 'yan din laging gamit ng tatay ko. nakakatuwang pakinggan yung clicks ng relay, kita mo kaagad kung saan merong mali yung logic mo.

more on instrumentation kasi ako eh. at pag me free time eh yun ang inaatupag ko. gaya ng mga motor controls, sequencing nga mga relay... more on industrial part ang tipo ko... hehehehe....

br

[lito2012]

Please help me sa game show circuit

[bravokilo]

Educational Game
   

Electronics Educational Game

This educational game project can be used in a quiz competition to see which of the participants press the button first to answer questions posed by the quiz master. This constructional project is based on a latch CD74HC75 IC and a 4 input CD74AC20 NAND IC. The first person to press the switch will light up the LED designated for the person. The rest of the LEDs will not be able to be activated until the RESET button is pressed.

The truth table of the Latch IC and the NAND IC is as shown in the figures below.





Schematic Diagram

The schematic of first to press educational game is as shown below.






Initially when RESET button is pressed, the output of NAND gate from U2A will be logic "0" as all the inputs are at logic "1"state. As shown in the truth table for NAND gate, when all the inputs are "1", its output will be "0". Hence the output ofNAND gate from U2B will be logic "1" since an input of "0" will cause it to go to logic "1". The logic "1" to the latch indicates that it is ready to output any data once any of the button is pushed.

If the first button pushed is S1, the logic at its output 1Q will be logic "0" and caused LED1 to light up. At the same time,it caused the output of U2A to go into logic "1". Hence the output of U2B will be logic "0" causing the latch to be disable which means that the outputs of all the latches will be at their previous state. As a result, the player who pressed button S1 will be shown as the one who is first to press the button and so qualify to answer the question.

The RESET button will be pressed by the quiz master to prepare the circuit for the next game.

Parts List

The parts list of the project is as shown below.

[bravokilo]