2B-WHO IS THE FIRST
THE SPECIALITIES OF PROJECT
This is a electronic game which is played by 2 players. The project tells the player who is winner. Anybody can play this game. Mostly this project is used in the quiz contest. Through this game we can know who that who is the first player and who will give the reply.
TECHNICAL DESCRIPTION AND WORKING OF THE PROJECT
This project has been developed and tested by our readers and sent to the “T.V.Engineers Technical lab” for publication in the book. The spare parts and PCB of the projects published in the series of our book publication or available in the market. The information of project code is given in the first and last page of the books.
This project can be assembled on a small PCB. This project can be run on 3 dry cell or battery with 4.5V DC output. This is a small circuit in which IC 7402 is used. The IC is Quad-2 Input NOR Gates. There are two switches in the circuit and with every switch there is LED. When any switch is pressed then the LED connected with that switch glows. In this condition if we press the another switch but the LED connected to the switch will not glow. When any switch is pressed then resistance R1 and R2 keep the input level of the gate high because Gate is NOR gate. Therefore the gate of another switch remains in low position in the beginning. When S1 is pressed then Pin No.3 of the Gate goes Low. In this condition Gate1(A) has two input and output Pin No.5 will be high. On pressing switch S2 the output of Gate No.2 remains in low position. This makes LED on Gate No.2 OFF.
PRECAUTIONS WHILE MAKING THE PROJECT
1. Check the PCB and components before assembling the project.
2. Use the LEDs of high glow type.
3. The switches should be Press ON time and of good quality.
Avoid shorting and make good contact while soldering the PCB.