AQA A LEVEL PHYSICS 7408/3BE PAPER 3 SECTION B ELECTRONICS VERSION 1.0 FINAL QUESTION PAPERS & MERGED MARKING SCHEME | JUNE 2023

Figure 1 shows the input and output pins for a 4-bit binary counter. The output pin for the least significant bit is A. Figure 1 0 1 . 1 Complete Figure 1 by adding a single logic gate to the binary counter so that the circuit functions as a modulo-6 counter. [2 marks] Figure 2 shows three outputs of the modulo-6 counter connected to a logic sub-system that controls a 7-segment display. The decimal point on the display is not shown. The whole system shown in Figure 2 is to be used as an electronic dice. Figure 2 Segments in the 7-segment display are turned on or off by the logic sub-system to display the decimal numbers 1 to 6 in sequence. A segment in the display turns on when the logic output with the same letter as the segment is at logic 1