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[h=2]Table of Electrical Symbols[/h]
SymbolComponent nameMeaning
[h=4]Wire Symbols[/h]
wire.GIF
Electrical WireConductor of electrical current
wires%20connected.GIF
Connected WiresConnected crossing
wires%20not%20connected.GIF
Not Connected WiresWires are not connected
[h=4]Switch Symbols and Relay Symbols[/h]
switch.GIF
SPST Toggle SwitchDisconnects current when open
switch%20II.GIF
SPDT Toggle SwitchSelects between two connections
push%20button.GIF
Pushbutton Switch (N.O)Momentary switch - normally open
push%20button%20II.GIF
Pushbutton Switch (N.C)Momentary switch - normally closed
dip_switch.GIF
DIP SwitchDIP switch is used for onboard configuration
relay_spst.GIF
SPST RelayRelay open / close connection by an electromagnet
relay_spdt.GIF
SPDT Relay
jumper.GIF
JumperClose connection by jumper insertion on pins.
solder%20bridge.GIF
Solder BridgeSolder to close connection
[h=4]Ground Symbols[/h]
ground%20earth.GIF
Earth GroundUsed for zero potential reference and electrical shock protection.
ground%20chassis.GIF
Chassis GroundConnected to the chassis of the circuit
ground%20digital.GIF
Digital / Common Ground
[h=4]Resistor Symbols[/h]
resistor.GIF
Resistor (IEEE)Resistor reduces the current flow.
resistor%20II.GIF
Resistor (IEC)
potentiometer.GIF
Potentiometer (IEEE)Adjustable resistor - has 3 terminals.
potentiometer%20II.GIF
Potentiometer (IEC)
variable%20resistor.GIF
Variable Resistor / Rheostat (IEEE)Adjustable resistor - has 2 terminals.
variable_resistor%20II.GIF
Variable Resistor / Rheostat (IEC)
trimmer_resistor_II.gif
Trimmer ResistorPreset resistor
thermistor.gif
ThermistorThermal resistor - change resistance when temperature changes
photoresistor.gif
Photoresistor / Light dependent resistor (LDR)Photo-resistor - change resistance with light intensity change
[h=4]Capacitor Symbols[/h]
capacitor.GIF
CapacitorCapacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC.
capacitor%20II.GIF
Capacitor
capacitor%20polarized.GIF
Polarized CapacitorElectrolytic capacitor
capacitor%20polarized%20II.GIF
Polarized CapacitorElectrolytic capacitor
variable%20capacitor.GIF
Variable CapacitorAdjustable capacitance
[h=4]Inductor / Coil Symbols[/h]
inductor.GIF
InductorCoil / solenoid that generates magnetic field
inductor%20iron.GIF
Iron Core InductorIncludes iron
inductor%20variable.GIF
Variable Inductor
[h=4]Power Supply Symbols[/h]
voltage%20source.GIF
Voltage SourceGenerates constant voltage
current%20source.GIF
Current SourceGenerates constant current.
AC%20source.GIF
AC Voltage SourceAC voltage source
generator.GIF
GeneratorElectrical voltage is generated by mechanical rotation of the generator
battery%20cell.GIF
Battery CellGenerates constant voltage
battery.GIF
BatteryGenerates constant voltage
controlled%20voltage%20source.GIF
Controlled Voltage SourceGenerates voltage as a function of voltage or current of other circuit element.
controlled%20current%20source.GIF
Controlled Current SourceGenerates current as a function of voltage or current of other circuit element.
[h=4]Meter Symbols[/h]
voltmeter.GIF
VoltmeterMeasures voltage. Has very high resistance. Connected in parallel.
ammeter.GIF
AmmeterMeasures electric current. Has near zero resistance. Connected serially.
ohmmeter.GIF
OhmmeterMeasures resistance
wattmeter.GIF
WattmeterMeasures electric power
[h=4]Lamp / Light Bulb Symbols[/h]
lamp.GIF
Lamp / light bulbGenerates light when current flows through
lamp2.GIF
Lamp / light bulb
lamp3.GIF
Lamp / light bulb
[h=4]Diode / LED Symbols[/h]
diode.GIF
DiodeDiode allows current flow in one direction only - left (anode) to right (cathode).
zener%20diode.GIF
Zener DiodeAllows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage
schottky%20diode.GIF
Schottky DiodeSchottky diode is a diode with low voltage drop
varicap%20diode.GIF
Varactor / Varicap DiodeVariable capacitance diode
tunnel_diode.GIF
Tunnel Diode
led.GIF
Light Emitting Diode (LED)LED emits light when current flows through
photodiode.GIF
PhotodiodePhotodiode allows current flow when exposed to light
[h=4]Transistor Symbols[/h]
NPN%20transistor.GIF
NPN Bipolar TransistorAllows current flow when high potential at base (middle)
PNP%20transistor.GIF
PNP Bipolar TransistorAllows current flow when low potential at base (middle)
Darlington%20transistor.GIF
Darlington TransistorMade from 2 bipolar transistors. Has total gain of the product of each gain.
JFET-N%20transistor.GIF
JFET-N TransistorN-channel field effect transistor
JFET-P%20transistor.GIF
JFET-P TransistorP-channel field effect transistor
NMOS%20transistor.GIF
NMOS TransistorN-channel MOSFET transistor
PMOS%20transistor.GIF
PMOS TransistorP-channel MOSFET transistor
[h=4]Misc. Symbols[/h]
motor.GIF
MotorElectric motor
transformer.GIF
TransformerChange AC voltage from high to low or low to high.
electric_bell.PNG
Electric bellRings when activated
buzzer.PNG
BuzzerProduce buzzing sound
fuse.GIF
FuseThe fuse disconnects when current above threshold. Used to protect circuit from high currents.
fuse%20II.GIF
Fuse
bus.GIF
BusContains several wires. Usually for data / address.
bus%20II.GIF
Bus
bus%20III.GIF
Bus
optocoupler.GIF
Optocoupler / Opto-isolatorOptocoupler isolates connection to other board
speaker.GIF
LoudspeakerConverts electrical signal to sound waves
microphone.GIF
MicrophoneConverts sound waves to electrical signal
operational%20amplifier.GIF
Operational AmplifierAmplify input signal
schmitt%20trigger.GIF
Schmitt TriggerOperates with hysteresis to reduce noise.
adc.GIF
Analog-to-digital converter (ADC)Converts analog signal to digital numbers
dac.GIF
Digital-to-Analog converter (DAC)Converts digital numbers to analog signal
oscillator%20crystal.GIF
Crystal OscillatorUsed to generate precise frequency clock signal
[h=4]Antenna Symbols[/h]
antenna.GIF
Antenna / aerialTransmits & receives radio waves
antenna%20III.GIF
Antenna / aerial
antenna%20II.GIF
Dipole AntennaTwo wires simple antenna
[h=4]Logic Gates Symbols[/h]
NOT%20gate.GIF
NOT Gate (Inverter)Outputs 1 when input is 0
AND%20gate.GIF
AND GateOutputs 1 when both inputs are 1.
NAND%20gate.GIF
NAND GateOutputs 0 when both inputs are 1. (NOT + AND)
OR%20gate.GIF
OR GateOutputs 1 when any input is 1.
NOR%20gate.GIF
NOR GateOutputs 0 when any input is 1. (NOT + OR)
XOR%20gate.GIF
XOR GateOutputs 1 when inputs are different. (Exclusive OR)
D%20flip-flop.GIF
D Flip-FlopStores one bit of data
mux%20II.GIF
Multiplexer / Mux 2 to 1Connects the output to selected input line.
mux.GIF
Multiplexer / Mux 4 to 1
demux.GIF
Demultiplexer / Demux 1 to 4Connects selected output to the input line.
 
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