Electrical Quiz Master circuit description of operation
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QUIZMASTER is a device that uses electronics to decide who pushes a button first, deciding who has the right to answer the question. The first pushed button literally grabs the power and uses it to turn on its LED. No other button pressed even milliseconds after the first one turns on its LED. This is achieved by using a 4011 CMOS I.C for each player and connecting them through a final output. The 4011 chip is known as the NAND 2 Quad inputs. They are digital chips and consist of a set-reset flip-flop on pins 4,5,6 and 8,9,10, with a NAND gate on the input pins 1.2. The pins 11, 12, 13 of the control chip, together with the flip-flop diodes and outputs, are combined to form a multi-input NOR gate. As long as the outputs of all chips remain low, the output of the control chip is high. When a button is pressed, the NAND gate is deactivated and activates the high flip-flop. This activates the transistor connected to pins 4 and 8, supplying power to turn on the LED of that chip. When this occurs, the NOR gate is lowered by taking all the low inputs, thus preventing any other chip from turning on. The Quiz master is reset by a reset button that resets the circuit ready for the next question. QUIZ MASTER is extremely fast, is infallible, and can not be split in any way. It will determine with precision and without any doubt, which button is pushed first. The circuit is unique in that each player has a module. Modules for additional players can be added with virtually no limit on the number of players. The modules are added to the matrix and interconnect to the control NOR gate.