# Step 1: Logic Gates Connection & System Overview ### i) Logic Gates Connection - **IC 7474**: This is a Dual D-type Flip-Flop, which can be used to store the alarm state (triggered or reset). - **IC 7408**: This is a Quad 2-Input AND Gate, useful for creating logic conditions (e.g., when both a problem is detected and the system is enabled). **Connection Explanation:** - Connect the output of the sensor (problem detector) to one input of an AND gate (from 7408). - The other input of the AND gate can be connected to a system enable/ready signal. - The output of the AND gate is connected to the clock (CLK) input of the 7474 flip-flop. - The D input of the 7474 is tied HIGH (logic 1), so when clocked, Q output will go HIGH (alarm ON). **Explanation:** The AND gate ensures the alarm is only triggered when both a problem is detected and the system is enabled. The flip-flop stores the alarm state, keeping the alarm ON until it is reset. --- ### ii) Overview of the System - **Sensors** detect problems on the production line. - **AND gates** (7408 IC) check if both the sensor detects a problem and the system is enabled. - **Flip-flop** (7474 IC) latches the alarm state. - **Outputs** from the flip-flop drive both an audible (buzzer) and visible (LED) alarm. - **Reset mechanism** allows manual or automatic resetting of the alarm. **Explanation:** This system setup allows the alarm to be triggered only under the right conditions and ensures that the alarm remains ON until it is consciously reset, preventing unnoticed issues. --- # Step 2: Trigger & Reset the Alarm ### iii) Trigger the Alarm - When a problem occurs, the sensor sends a HIGH signal. - The AND gate outputs HIGH only if the system is enabled. - The HIGH output clocks the 7474 flip-flop, setting Q HIGH. - Q output activates the buzzer and LED (alarm). **Explanation:** The alarm is triggered and latched ON as soon as a problem is detected, ensuring immediate response. --- ### iv) Reset the Alarm - A reset button is connected to the CLEAR (CLR) pin of the 7474 flip-flop. - Pressing the reset button pulls CLR LOW, setting Q output LOW. - This turns OFF the alarm (buzzer and LED). **Explanation:** The alarm can only be turned OFF manually (or optionally, automatically if desired), ensuring the problem is acknowledged before silencing the alarm. --- ## **Final Answer** By using the 7474 flip-flop and 7408 AND gate ICs, you can design a production line alarm system that: - Triggers both audible and visible alarms when a problem is detected and the system is enabled. - Latches the alarm state (remains ON) until it is manually reset via a CLEAR input. - Ensures issues are noticed and not reset without acknowledgment.