Circuit Symbol Gallery
The same 100 circuit symbols as the List of Circuit Symbols, laid out five across so you can find a shape by eye. Select any symbol's name to jump to its full description.
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A 555 timer is used to generate delays, pulses, and oscillating signals.
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An AC current source supplies a current that periodically reverses direction.
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An AC voltage source supplies a voltage that periodically reverses polarity.
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An ammeter is connected in series to measure electric current.
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An analog meter uses a moving pointer to display an electrical measurement.
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An AND gate produces a high output only when all of its inputs are high.
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An antenna transmits or receives electromagnetic radio-frequency signals.
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An audio jack provides a detachable connection for analog audio signals.
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A battery supplies DC electrical energy from two or more cells.
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A battery cell represents a single electrochemical source of DC voltage.
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An NPN bipolar transistor is used for current-controlled switching and amplification.
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A PNP bipolar transistor is used for high-side switching and current-controlled amplification.
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A bridge rectifier converts both halves of an AC waveform into pulsating DC.
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A buffer gate strengthens or isolates a digital signal without inverting it.
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A bus connection shows a group of related conductors joining a circuit bus.
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A capacitor stores electric charge and is used for filtering, timing, coupling, and energy storage.
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Chassis ground marks a connection to a device's conductive frame or enclosure.
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A circuit breaker automatically opens a circuit during an overload and can be reset.
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A coaxial connector joins a shielded cable while preserving its center conductor and outer shield.
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A controlled current source produces current determined by another circuit voltage or current.
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A controlled voltage source produces voltage determined by another circuit voltage or current.
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A crystal provides a highly stable resonant frequency for oscillators and clocks.
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A current source supplies a specified current largely independent of its load voltage.
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A D flip-flop stores one bit by capturing its data input on a clock transition.
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A DC voltage source maintains a fixed-polarity potential difference.
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A DIAC conducts in either direction after its breakover voltage is reached and commonly triggers TRIACs.
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A diode conducts primarily in one direction and is used for rectification and protection.
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A DIP switch provides a compact bank of manual configuration switches.
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A double-pole double-throw switch changes two separate circuits between two paths.
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A double-pole single-throw switch opens or closes two separate circuits together.
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Earth ground marks a conductive connection to the physical earth for safety or reference.
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A female connector or jack accepts a mating plug to make a removable connection.
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A fuse melts and permanently opens a circuit when excessive current flows.
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A galvanometer detects or measures small electric currents with a sensitive moving coil.
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A header connector provides an organized row or grid of removable signal and power connections.
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An N-channel IGBT provides gate-controlled switching for high-voltage or high-current loads.
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A P-channel IGBT represents a complementary insulated-gate bipolar power switch.
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An inductor stores energy in a magnetic field and is used in filters and power converters.
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An integrated-circuit symbol represents a packaged electronic function with multiple pins.
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A NOT gate produces the opposite logical state from its input.
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An N-channel JFET controls current through an N-type channel with a reverse-biased gate.
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A P-channel JFET controls current through a P-type channel with a reverse-biased gate.
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A junction dot marks conductors that are electrically connected at the same node.
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A lamp converts electrical energy into light and may also serve as an indicator or load.
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A light-emitting diode produces light when forward biased and is used for indication or illumination.
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A microphone converts sound into an electrical signal.
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A motor converts electrical energy into rotational mechanical motion.
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A multiplexer selects one of several inputs and connects it to a single output.
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A NAND gate produces a low output only when all of its inputs are high.
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A neon lamp glows when its gas ionizes and is commonly used as a high-voltage indicator.
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An NMOS transistor is a voltage-controlled device widely used for low-side switching and digital logic.
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A no-connection mark identifies a pin or wire end that is intentionally left unconnected.
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A NOR gate produces a high output only when all of its inputs are low.
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An operational amplifier amplifies the voltage difference between its two inputs.
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An optocoupler transfers a signal with light to provide electrical isolation.
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An oscilloscope displays how an electrical signal changes over time.
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An outlet represents a mains receptacle that supplies power to a connected load.
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A photodiode converts incident light into current and is used as a light sensor.
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A photoresistor changes resistance with light level and is used for simple light sensing.
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An NPN phototransistor uses light to control collector current for sensitive optical detection.
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A PNP phototransistor uses light to control a complementary transistor current path.
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A plug is the male half of a removable electrical connector.
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A PMOS transistor is a voltage-controlled device commonly used for high-side switching and CMOS logic.
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A potentiometer is an adjustable three-terminal resistor used as a voltage divider.
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A pulse source produces timed voltage transitions for testing switching and digital circuits.
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A normally closed push button opens its contacts only while it is pressed.
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A normally open push button closes its contacts only while it is pressed.
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A reed switch changes state in response to a nearby magnetic field.
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A relay uses an energized coil to operate electrically isolated switch contacts.
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A resistor limits current, divides voltage, and sets operating conditions in a circuit.
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A rotary switch selects one of several circuit connections by turning a shaft.
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A sawtooth source generates a ramp waveform with a rapid return for timing and sweep circuits.
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A Schmitt trigger adds hysteresis so a noisy or slowly changing input becomes a clean digital signal.
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A Schottky diode provides fast switching and a low forward-voltage drop.
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A silicon-controlled rectifier latches on after a gate trigger and controls high-power current.
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A seven-segment display combines illuminated bars to show decimal digits.
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Signal ground marks the common reference node used by low-level circuit signals.
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A solar cell converts light energy directly into electrical energy.
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A spark gap conducts across an air gap when the voltage exceeds its breakdown level.
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A single-pole double-throw switch connects one common terminal to either of two paths.
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A speaker converts an electrical audio signal into sound.
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A single-pole single-throw switch simply opens or closes one circuit path.
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A square-wave source alternates sharply between two levels for clocks and switching tests.
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A terminal marks a designated point for connecting a wire, lead, or external circuit.
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A thermistor changes resistance with temperature and is used for sensing or current limiting.
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A transformer transfers AC energy between windings for voltage conversion or isolation.
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A tri-state buffer can drive high, drive low, or disconnect its output electrically.
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A TRIAC controls AC power by conducting in either direction after a gate trigger.
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A tunnel diode uses negative differential resistance for very fast switching and oscillation.
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A vacuum tube diode permits electron flow from a heated cathode to an anode for rectification.
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A varactor diode acts as a voltage-controlled capacitor in tuning and RF circuits.
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A variable capacitor adjusts capacitance for tuning resonant and filter circuits.
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A variable resistor provides an adjustable resistance for calibration or control.
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VDD marks the positive supply rail in MOS and digital circuits.
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A voltmeter is connected in parallel to measure potential difference.
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VSS marks the lower or negative supply rail in MOS and digital circuits.
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A Wheatstone bridge compares resistances and is used for precise sensing and measurement.
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An XNOR gate produces a high output when its inputs have the same logical state.
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An XOR gate produces a high output when its inputs have different logical states.
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A Zener diode maintains a nearly constant reverse voltage for regulation and protection.