DT Y8 EOY exam Flashcards
Learn alarm components' functions (11 cards)
What is the purpose of the trigger switch SW2?
To trigger the alarm by completing the circuit
SW2 is a pressure pad that activates when pressed.
What is the capacitance value of capacitor C1?
10 nF
10nF stands for 10 nanofarads.
What is the function of the 10nF capacitor in the circuit?
To smooth the noisy signal generated by the switch and allow a smooth current to flow to the gate of the thyristor
Capacitors store and discharge electrical energy.
What type of component is T1 in the circuit?
Thyristor
T1 is specifically a 2N5061 thyristor.
What is the main function of a thyristor?
To allow current to flow from the positive end to the negative end when current is present at the gate
Thyristors act like diodes but require a gate current to conduct.
How does a thyristor behave when there is no current at the gate?
It acts like an open switch
Thyristors are polarized devices.
What happens when the gate of the thyristor is charged?
The thyristor latches closed and completes the circuit
This action activates the output in the circuit.
What is the resistance value of resistor R2?
1kΩ
R2 is a 1 kilohm resistor.
What is the function of resistor R2 in the circuit?
To control/limit the amount of current going through the circuit and protect the anode of the thyristor
Resistors are used to manage current flow.
What is BZ1 in the circuit?
Buzzer
BZ1 is an electromechanical sounder.
What is the function of the buzzer in the circuit?
To produce an audible noise when electric current flows through it
The buzzer sounds when the pressure pad is activated.
