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Electronic systems
Electronic systems are made up of 3 parts:
1) An INPUT SENSOR ­ these detect changes in the
2) A PROCESSOR ­ these decide what action is needed
3) An OUTPUT DEVICE ­ these are controlled by the
Examples:…read more

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Logic gates NOT gate ­ "the output is
NOT what the input is"
Logic gates are the basics
behind any kind of Input Output
processor. There are 3 0 1
that you need to know for 1 0
Input A Input B Output
0 0 0
AND ­ "the output is on if A
0 1 0
AND B are both on"
1 0 0
1 1 1
Input A Input B Output
0 0 0
OR ­ "the output is on if A 0 1 1
OR B are on" 1 0 1
1 1 1…read more

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Logic gate symbols
NOT gate:
AND gate:
OR gate:…read more

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Some problems to solve
· The pump on a central heating system is switched on at room
temperature if the system is switched on (with the slide switch).
When the temperature rises the pump needs to be switched off.
· Design a circuit that will sound a buzzer if the temperature of a
hot radiator falls during the day ONLY. Include a test switch to
check the operation of the buzzer.
· Design a circuit for a gardener that will warn them of cold
conditions at night. The alarm should be able to be switched off.…read more

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Circuits such as those containing logic gates only take very ______
currents. These circuits may be needed to operate a device that takes
a much _____ current, e.g. a _________. To do this the circuit would
need a RELAY switch, a device made of an _______ that can operate a
switch. A relay switch is activated by the small current and the switch
part is placed in the circuit needing a large current:
Words ­ motor, larger, Symbol
electromagnet, small for relay:…read more

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