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Compone

nts

Symbol

ResistorA resistor limits

the amountof current

flowing in a circuit

Symbol Symbol

Preset ResistorVariable Resistor(Potentiometer)

The resistance betweenthe centre pin and the

other two depends on theposition of the wiper.

100u

F 16

V

100n

F

100V

SymbolSymbol

Electrolytic (polarised)Polyester (non-polarised)

A capacitor storeselectrical charge

Capacitor

Symbol

LDRLight

DependentResistor

The resistance of anLDR decreases as it

gets lighter

Symbol

CathodeAnode

Anode

Cathode

LEDLight

EmittingDiodeAn LED produces light

when connected theright way round.

The Anode must be positiveThe Cathode must be negative

CathodeAnode

CathodeAnode

DiodeA diode only allows

current to flow in onedirection.

Anode to Cathode

Base

Collector

Emitter

TransistorThe current flowing throughthe transistor is controlled

by the current flowinginto the base.

IRF530

Source

Drain

Gate

FETFieldEffect

TransistorThe current flowing through

a FET is controlled bythe voltage on the gate.

Anode Cathode

Gate

TIC106

Thyristor(SCR)A thyristor is a latch,it only conducts oncetriggered by a voltage

on the gate.

NE

555

1

2

3

4

8

7

6

5

555Timer

A 555 timer is anIntegrated Circuit (chip)used to create delays

and pulses.

PIC

08M

1

2

3

4

8

7

6

5

+5V

Output 0

Input 1 / Output 1

Input 2 / Output 2

0V

Serial In

Input 4 / Output 4

Input 3

PICPeripheralInterface

ControllerA PIC is a programmablechip that can performa range of functionsset by the program.