Symbol
Name
Power and
ground (Categories)
Pushbutton switch. Normally
Closed (NC)
Resistors
Battery (one cell). Negative
on the left.
(Categories)
Resistor (IEEE standard)
Battery. Negative on the left.
Resistor (IEC standard)
Solar cell
Potentiometer (IEEE
standard)
Earth ground
Chassis ground
Signal ground
Switches
Potentiometer (IEC
standard)
Photoresistor/Light
dependent resistor (LDR)
Photoresistor/Light
dependent resistor (LDR)
(Categories)
Switch (Single Pole, Single
Throw - SPST). Normally
Open (NO).
Thermistor (NTC - Negative
Temperature Coefficient
resistor)
Switch (Single Pole, Single
Throw - SPST). Normally
Closed (NC).
Thermistor (PTC - Positive
Temperature Coefficient
resistor)
Capacitors
Switch (Single Pole, Double
Throw - SPDT).
Pushbutton switch. Normally
Open (NO)
(Categories)
Capacitor (non-polarized)
Variable capacitor
Capacitor (polarized, e.g.
electrolytic)
MOSFET (P-channel,
enhancement-mode)
Capacitor (polarized, e.g.
electrolytic)
MOSFET (N-channel,
enhancement-mode, no
bulk)
Diodes
(Categories)
Diode
MOSFET (P-channel,
enhancement-mode, no
bulk)
Zener diode
MOSFET (N-channel,
enhancement-mode, no
bulk)
Schottky diode
MOSFET (P-channel,
enhancement-mode, no
bulk)
LED (Light-Emitting Diode)
Transistors
(Categories)
MOSFET (N-channel,
depletion-mode)
MOSFET (P-channel,
depletion-mode)
Transistor (NPN)
Relays
Transistor (NPN)
Relay (Single Pole, Single
Throw - SPST). Normally
Open (NO).
Transistor (PNP)
Relay (Single Pole, Single
Throw SPST). Normally
Closed (NC).
Transistor (PNP)
(Categories)
Relay (Single Pole, Double
Throw - SPDT)
Coils/inductors
s)
MOSFET (N-channel,
enhancement-mode)
Inductor/coil
(Categorie
Inductor/coil (alternate style)
Fuse (IEEE/ANSI standard)
Inductor/coil (with solid core
e.g. iron core)
Fuse (IEC standard)
Meters
Inductor/coil (with metal
particle core e.g. ferrite core)
(Categories)
Voltmeter
Variable inductor/coil
Ammeter
Solenoid
Ohmmeter
Transformers
(Categories)
Transformer (with a core)
Wattmeter
Connectors
Transformer (alternate style)
Transformer (with an air
core)
(Categories)
Jack socket/phone
connector
Jack socket/phone
connector. Plug enters from
the right.
Transformer (with a tap)
Pin header 6x1
Fuses
(Categories)
Fuse (IEEE/ANSI standard)
Pin header 6x2
Audio
(Categories)
Fuse (IEEE/ANSI standard)
Speaker
Buzzer