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Transcript 
ELECTRONICS

Frost Alarm
ELECTRONICS
When the thermistor
temp is high the
resistance is low and
the transistor is off.
ELECTRONICS

Frost Alarm
ELECTRONICS
When the thermistor
temp is low , the
resistance is high and
the transistor switches
on.
ELECTRONICS

Fire Alarm
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.
ELECTRONICS

Fire Alarm
ELECTRONICS
When the temp is cold the
thermistor takes most
voltage and so the
resistor takes little and
the transistor is off.
ELECTRONICS

Burglar Alarm
ELECTRONICS
When the L.D.R. is in the
light ,the resistance is low
so the voltage is low and
the transistor is off
ELECTRONICS

Burglar Alarm
ELECTRONICS
When the L.D.R. is in the dark
its resistance is high and the
transistor switches on.
ELECTRONICS

Time Delay Circuit
ELECTRONICS
When the capacitor charges
up to a certain voltage after
a certain time , the
transistor switches on.
ELECTRONICS
ELECTRONICS
There are 3 process devices,
The NOT gate
The AND gate
The OR gate
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