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ELECTRONICS Frost Alarm Frost Alarm. ELECTRONICS When the thermistor temp is high the resistance is low and the transistor is off.

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Presentation on theme: "ELECTRONICS Frost Alarm Frost Alarm. ELECTRONICS When the thermistor temp is high the resistance is low and the transistor is off."— Presentation transcript:

1 ELECTRONICS Frost Alarm Frost Alarm

2 ELECTRONICS When the thermistor temp is high the resistance is low and the transistor is off.

3 ELECTRONICS Frost Alarm Frost Alarm

4 ELECTRONICS When the thermistor temp is low, the resistance is high and the transistor switches on.

5 ELECTRONICS Fire Alarm Fire Alarm

6 ELECTRONICS When the temp is hot the thermistor resistance is low so it takes little voltage and so the resistor takes most of the voltage and so the transistor switches on.

7 ELECTRONICS Fire Alarm Fire Alarm

8 ELECTRONICS When the temp is cold the thermistor takes most voltage and so the resistor takes little and the transistor is off.

9 ELECTRONICS Burglar Alarm Burglar Alarm

10 ELECTRONICS When the L.D.R. is in the light,the resistance is low so the voltage is low and the transistor is off

11 ELECTRONICS Burglar Alarm Burglar Alarm

12 ELECTRONICS When the L.D.R. is in the dark its resistance is high and the transistor switches on.

13 ELECTRONICS Time Delay Circuit Time Delay Circuit

14 ELECTRONICS When the capacitor charges up to a certain voltage after a certain time, the transistor switches on.

15 ELECTRONICS

16 ELECTRONICS There are 3 process devices, The NOT gate The AND gate The OR gate

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