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Electronics revision Nicholas wills and Ross
Evans

Materials, Processes and Practices

Plastics

Properties of Plastics: Electrical insulator, Thermal insulator, Weather resistant, Chemical
resistant, Corrosion resistant, heat resistant, many colours available, easily shaped and formed, easily
injected blown and formed, easily fabricated. Self Lubricating, Impact Resistant.
Thermoplastics can be heated and…

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Electronics revision Nicholas wills and Ross
Evans

Thermocolour Sheet ­ Changes colour when heated, if touched by hand it causes the material to
change colour. Can be heated by attaching a resistance wire and can be used as a heating element when a
small current is passed through.
Liquid Crystal…

Page 3

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Electronics revision Nicholas wills and Ross
Evans

Batteries

Batteries are self-contained energy sources that convert chemical energy into electrical energy.
They come in different sizes and voltages, they different internal properties which makes them useful for
different uses.
Zinc-Carbon Battery ­ The most basic battery, it is cheaper than alkali.…

Page 4

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Electronics revision Nicholas wills and Ross
Evans

Capacitors

Capacitors store electrical charge the capacitance value and the working voltage is printed on the
capacitor. Capacitors can be used to create time delays in a monostable, control the frequency of pulse
generators in an astable, smooth the input across the power…

Page 5

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Electronics revision Nicholas wills and Ross
Evans

Thyristor

Similar to diode. Is a bistable device (meaning it has two states and can only be changed by
setting and resetting). A Thyristor stays latched on until its reset by interrupting the current flow through
it.
A thyristor can by switched on…

Page 6

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Electronics revision Nicholas wills and Ross
Evans



Integrated Circuits

555 IC Monostable

Time period = C*R
The minimum value of R1 should be 1k
The maximum value of R1 should be 1M
The minimum value of C1 should be 100pF
The maximum value of C1 should be 1000µF
The minimum…

Page 7

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Electronics revision Nicholas wills and Ross
Evans



Logic Gates

Logic gates: AND, OR, NOT, NAND, NOR, EXCLUSIVE OR.
AND gate output will be high if both A and B will be high








OR gate output will be high if A is on or if B is on but low is…

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Electronics revision Nicholas wills and Ross
Evans




NOR gate Output only high is A and B is low








EXOR gate output will be high when A or B is high








Circuits Made from NAND gates

Astable circuits ­ two NAND gates as NOT gates
Time delay circuits
Latch circuits




8…

Page 9

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Electronics revision Nicholas wills and Ross
Evans




Infra-red

The most popular remote control technology in the home is Infra-Red (IR). The reference to red is
the colour of the longest wave length of visible light. The basic concept with infra-red is the use of
invisible light to carry signals between…

Page 10

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Electronics revision Nicholas wills and Ross
Evans

The address code also reduces the chance of the infra-red receiver responding to a remote control
intended for another appliance




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