Electrical Schematic Symbols Flashcards by Redshiftlight Unknown

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Electrical WireConductor of electrical current

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Connected WiresConnected crossing

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Not Connected WiresWires are not connected

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SPST Toggle SwitchDisconnects current when open

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SPDT Toggle SwitchSelects between two connections

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Pushbutton Switch (N.O)Momentary switch - normally open

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Pushbutton Switch (N.C)Momentary switch - normally closed

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DIP SwitchDIP switch is used for onboard configuration

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SPST RelayRelay open / close connection by an electromagnet

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SPDT Relay - Relay open / close connection by an electromagnet

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Jumper Close connection by jumper insertion on pins.

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Solder Bridge

Solder to close connection

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Earth Ground

Used for zero potential reference and electrical shock protection.

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Chassis Ground

Connected to the chassis of the circuit

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Digital / Common Ground

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Resistor (IEEE)

Resistor reduces the current flow.

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Resistor (IEC)

Resistor reduces the current flow.

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Potentiometer (IEEE)

Adjustable resistor - has 3 terminals.

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Potentiometer (IEC)

Adjustable resistor - has 3 terminals.

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Variable Resistor / Rheostat (IEEE)

Adjustable resistor - has 2 terminals.

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Variable Resistor / Rheostat (IEC)

Adjustable resistor - has 2 terminals.

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Trimmer ResistorPreset resistor

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ThermistorThermal resistor - change resistance when temperature changes

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Photoresistor / Light dependent resistor (LDR)

Photo-resistor - change resistance with light intensity change

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Capacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC.

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Capacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC.

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Polarized CapacitorElectrolytic capacitor

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Polarized CapacitorElectrolytic capacitor

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Variable Capacitor

Adjustable capacitance

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InductorCoil / solenoid that generates magnetic field

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Iron Core Inductor

Includes iron

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Variable Inductor

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Voltage Source

Generates constant voltage

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Current Source

Generates constant current.

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AC Voltage Source

AC voltage source

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GeneratorElectrical voltage is generated by mechanical rotation of the generator

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Battery Cell

Generates constant voltage

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BatteryGenerates constant voltage

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Controlled Voltage Source

Generates voltage as a function of voltage or current of other circuit element.

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Controlled Current Source

Generates current as a function of voltage or current of other circuit element.

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Lamp / light bulb

Generates light when current flows through

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Lamp / light bulb

Generates light when current flows through

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Lamp / light bulb

Generates light when current flows through

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Diode

Diode allows current flow in one direction only - left (anode) to right (cathode).

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Zener Diode

Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage

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Schottky Diode

Schottky diode is a diode with low voltage drop

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Varactor / Varicap Diode

Variable capacitance diode

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Tunnel Diode

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Light Emitting Diode (LED)

LED emits light when current flows through

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Photodiode

Photodiode allows current flow when exposed to light

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NPN Bipolar Transistor

Allows current flow when high potential at base (middle)

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PNP Bipolar Transistor

Allows current flow when low potential at base (middle)

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Darlington Transistor

Made from 2 bipolar transistors. Has total gain of the product of each gain.

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JFET-N Transistor

N-channel field effect transistor

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JFET-P Transistor

P-channel field effect transistor

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NMOS Transistor

N-channel MOSFET transistor

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PMOS Transistor

P-channel MOSFET transistor

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Motor

Electric motor

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Transformer

Change AC voltage from high to low or low to high.

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Electric bell

Rings when activated

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Buzzer

Produce buzzing sound

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Fuse

The fuse disconnects when current above threshold. Used to protect circuit from high currents.

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Fuse

The fuse disconnects when current above threshold. Used to protect circuit from high currents.

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Bus

Contains several wires. Usually for data / address.

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Bus

Contains several wires. Usually for data / address.

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Bus

Contains several wires. Usually for data / address.

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Optocoupler / Opto-isolator

Optocoupler isolates connection to other board

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Loudspeaker

Converts electrical signal to sound waves

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Microphone

Converts sound waves to electrical signal

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Operational Amplifier

Amplify input signal

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Schmitt Trigger

Operates with hysteresis to reduce noise.

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Analog-to-digital converter (ADC)

Converts analog signal to digital numbers

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Digital-to-Analog converter (DAC)

Converts digital numbers to analog signal

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Crystal Oscillator

Used to generate precise frequency clock signal

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Antenna / aerial

Transmits & receives radio waves

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Antenna / aerial

Transmits & receives radio waves

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Dipole Antenna

Two wires simple antenna

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NOT Gate (Inverter)

Outputs 1 when input is 0

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AND Gate

Outputs 1 when both inputs are 1.

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NAND Gate

Outputs 0 when both inputs are 1. (NOT + AND)

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OR Gate

Outputs 1 when any input is 1.

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NOR Gate

Outputs 0 when any input is 1. (NOT + OR)

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XOR Gate

Outputs 1 when inputs are different. (Exclusive OR)

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D Flip-Flop

Stores one bit of data

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Multiplexer / Mux 2 to 1

Connects the output to selected input line.

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Multiplexer / Mux 4 to 1

Connects the output to selected input line.

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Demultiplexer / Demux1 to 4

Connects selected output to the input line.