NOTE:
This is not finished, just in bulk, need diy yourself.

Description:
This product is a practice kit, buyers need to weld by your selself.And the suit kit is equipped with an instruction in Chinese.The success rate is very high.
The Circuit includes Responder, coding, priority, latches, digital and reset circuit.
Eight priority can simultaneously answer, after the button is pressed,
the buzzer sound, while digital display numeral priority answer who, after a successful answer, press the button, the display will not change unless press the reset button.
After the reset, the display is cleared, we can continue to answer.
S01-S08 for the answer key, S09 of the reset button.
CD4511 is a piece containing BCD-7 segment latch / decoder / driver integrated circuit in one of which the 1,2,6,7 BCD code input, 9 to 15 feet for the display output pin 3 (LT) to test the output terminal when the "LT" is 0, the output of all for 1,4 feet (BI) for the blanking end, BI is 0 to full output 0,5 feet (LE) for the latch enable terminal, when LE from "0" to "1", the output of the state holding LE display of 0:00. 16 feet for the positive power supply, negative power supply 8 feet. Peripheral circuit Responder information ring circuit. 0.5-inch digital tube connected common cathode LED.