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.

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

Polarized CapacitorElectrolytic capacitor

Polarized CapacitorElectrolytic capacitor

Variable Capacitor Adjustable capacitance

InductorCoil / solenoid that generates magnetic field

Iron Core Inductor Includes iron

Variable Inductor

Voltage Source Generates constant voltage

Current Source Generates constant current.

AC Voltage Source AC voltage source

GeneratorElectrical voltage is generated by mechanical rotation of the generator

Battery Cell Generates constant voltage

BatteryGenerates constant voltage

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

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

Lamp / light bulb Generates light when current flows through

Lamp / light bulb Generates light when current flows through

Lamp / light bulb Generates light when current flows through

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

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

Schottky Diode Schottky diode is a diode with low voltage drop

Varactor / Varicap Diode Variable capacitance diode

Tunnel Diode

Light Emitting Diode (LED) LED emits light when current flows through

Photodiode Photodiode allows current flow when exposed to light

NPN Bipolar Transistor Allows current flow when high potential at base (middle)

PNP Bipolar Transistor Allows current flow when low potential at base (middle)

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

JFET-N Transistor N-channel field effect transistor

JFET-P Transistor P-channel field effect transistor

NMOS Transistor N-channel MOSFET transistor

PMOS Transistor P-channel MOSFET transistor

Motor Electric motor

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

Electric bell Rings when activated

Buzzer Produce buzzing sound

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

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

Bus Contains several wires. Usually for data / address.

Bus Contains several wires. Usually for data / address. ****

Bus Contains several wires. Usually for data / address.

Optocoupler / Opto-isolator Optocoupler isolates connection to other board

Loudspeaker Converts electrical signal to sound waves

Microphone Converts sound waves to electrical signal

Operational Amplifier Amplify input signal

Schmitt Trigger Operates with hysteresis to reduce noise.

Analog-to-digital converter (ADC) Converts analog signal to digital numbers

Digital-to-Analog converter (DAC) Converts digital numbers to analog signal

Crystal Oscillator Used to generate precise frequency clock signal

Antenna / aerial Transmits & receives radio waves

Antenna / aerial Transmits & receives radio waves

Dipole Antenna Two wires simple antenna

NOT Gate (Inverter) Outputs 1 when input is 0

AND Gate Outputs 1 when both inputs are 1.

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

OR Gate Outputs 1 when any input is 1.

NOR Gate Outputs 0 when any input is 1. (NOT + OR)

XOR Gate Outputs 1 when inputs are different. (Exclusive OR)

D Flip-Flop Stores one bit of data

Multiplexer / Mux 2 to 1 Connects the output to selected input line.

Multiplexer / Mux 4 to 1 Connects the output to selected input line.

Demultiplexer / Demux1 to 4 Connects selected output to the input line.