Question: (b) A decoder as shown in Figure 1 is a digital circuit that detects the presence of a specified combination of bits (code) on its

(b) A decoder as shown in Figure 1 is a digital

(b) A decoder as shown in Figure 1 is a digital circuit that detects the presence of a specified combination of bits (code) on its inputs and indicates the presence of that code by a specific output. Determine the logic gates required to decode the binary number by adding two hexadecimal number as shown in Figure 1 and turn ON LED-GREEN. Please use NOT gate and 2-inputs gate only. Satu penyahkod seperti dalam Rajah 1 adalah litar digital yang mengesan kehadiran gabungan bit (kod) yang ditentukan pada masukannya dan menunjukkan adanya kod tersebut dengan keluaran tertentu. Tentukan logik yang diperlukan untuk menyahkod nombor perduaan dengan menambah dua nombor perenambelas seperti ditunjukkan di Rajah 1 dan HIDUPKAN LED-HIJAU. Mohon gunakan get NOT dan get 2-masukan sahaja.) A 5V R1 100 40:6 D1 LED-GREEN Decoder Q1 BC547 666 Figure 1 (Rajah 11 (10 Marks/Markah) ...3/- SULIT SULIT (EMJ26204) (c) The following expression describes the way a logic circuit needs to operate in order to drive a seatbelt warning indicator in a car. Illustrate a circuit for this expression. [Ungkapan berikut menggambarkan cara litar logik boleh beroperasi untuk memandu penunjuk amaran tali pinggang keledar di dalam kereta. Gambarkan sebuah litar bagi ungkapan ini. "If the driver AND co-driver are present AND the driver is NOT buckled up and the ignition switch is ON, then turn ON the warning light" (6 Marks Markah) (d) Sensors are used to monitor the pressure and the temperature of a chemical solution stored in a vat. The circuitry for each sensor produces a HIGH voltage when a specified maximum value is exceeded. An alarm requiring LOW voltage input must be activated when either the pressure or the temperature is excessive. Illustrate a circuit for this application. [Penderia-penderia digunakan untuk memantau tekanan dan suhu larutan kimia yang disimpan dalam tong. Litar bagi setiap penderia menghasilkan voltan TINGGI apabila nilai dinyatakan melebihi maksimum. Penggera yang memerlukan input voltan RENDAH mesti diaktifkan apabila sama ada tekanan atau suhu yang berlebihan. Gambarkan sebuah litar bagi aplikasi ini.) (6 Marks/Markah)

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