Introduction - If you have any usage issues, please Google them yourself
This design uses 74 series of common integrated circuit design of digital display circuit eight responder composition, design ideas and functions. The design of the responder for 8 players or 8 teams, respectively, with 8 button S1~S8. Set a timeout, system reset and Responder control switch S, the switch is controlled by the moderator. When one of the first circuit is switched on, the device automatically cuts off the signal of the other circuit, and the device has the function of latch and display. The players press the button, the corresponding number of latches, and display in the LED digital tube, and the loudspeaker alarm prompt. As the countdown twenty seconds after no one answer, the system automatically reset, less than five seconds countdown alarm prompt.