Passive Components
The foundation of every circuit diagram. Use passive components for filtering, timing, biasing, and current limiting in your schematics.
- Resistor
- Capacitor
- Inductor
- Potentiometer
- Fuse
- Thermistor
Component Library
Circuit Diagram Maker — Component Library & Symbol Reference
Browse the complete library of 40+ electronic symbols available in Circuit Diagram Maker. Every component follows IEEE and IEC schematic standards, ensuring your circuit diagrams are universally readable by engineers, students, and reviewers worldwide.
Each symbol in our circuit diagram maker is designed for clarity at any zoom level and exports crisply to both SVG and PNG formats. Components are organized into six categories covering passive parts, semiconductors, ICs, power elements, connectors, and electromechanical devices.
Active & Semiconductor
Semiconductors enable switching, amplification, and signal processing. Circuit Diagram Maker includes standard symbols for all common device types.
- Diode
- Zener Diode
- LED
- NPN Transistor
- PNP Transistor
- N-MOSFET
- P-MOSFET
Integrated Circuits
From analog op-amps to digital microcontrollers, IC symbols in our circuit diagram maker follow IEEE and IEC standards.
- Op-Amp
- Comparator
- Microcontroller
- Logic Gate (AND/OR/NOT)
- 555 Timer
- Voltage Regulator
Power Components
Map your power distribution clearly. Separate power paths from signal paths for clean, reviewable circuit diagrams.
- Battery
- DC Power Supply
- AC Source
- Transformer
- Ground Symbol
- Voltage Rail
Connectors & IO
Interface symbols define where your circuit connects to the outside world. Essential for PCB-ready schematics.
- Header Connector
- Terminal Block
- USB Port
- Test Point
- Antenna
- Probe Point
Electromechanical
Control real-world devices with electromechanical components. Our circuit diagram maker includes symbols for switches, relays, and actuators.
- Relay
- Switch (SPST/SPDT)
- Push Button
- Motor
- Speaker
- Buzzer
Complete Symbol Reference Table
Use these naming conventions to keep your circuit diagrams consistent across design reviews and documentation.
| Symbol | Category | Typical Use in Circuit Diagrams | Reference Designator |
|---|---|---|---|
| Resistor | Passive | Current limiting, voltage dividers, pull-up/down networks | R1, R2, R_PULL |
| Capacitor | Passive | Decoupling, filtering, timing, coupling | C1, C_BYPASS |
| Inductor | Passive | Energy storage, filtering, EMI suppression | L1, L_CHOKE |
| Diode | Semiconductor | Rectification, protection, clamping | D1, D_TVS |
| LED | Semiconductor | Status indication, illumination | LED1, LED_PWR |
| N-MOSFET | Power | Load switching, H-bridges, converters | Q1, Q_SW |
| Op-Amp | Analog IC | Amplification, filtering, comparison | U1A, U1B |
| Microcontroller | Digital IC | Logic, sequencing, communication | U2, MCU |
| Voltage Regulator | Power IC | Voltage regulation, LDO, switching | U3, REG |
| Connector | Interface | External wiring, board-to-board, IO | J1, J_USB |
| Relay | Electromechanical | High-power switching, isolation | K1, RLY |
| Switch | Electromechanical | User input, mode selection | SW1, SW_PWR |
How to Place Components in Circuit Diagram Maker
Adding components to your circuit diagram is straightforward. Open the Circuit Diagram Maker editor, browse or search the component library in the left sidebar, then drag any symbol onto the canvas. The component automatically snaps to the 20px grid for perfect alignment.
To rotate a placed component, select it and press R. To flip horizontally or vertically, press H or F. Double-click any component to edit its label and reference designator.
Once components are placed, switch to the Wire tool (press W) and click from pin to pin to connect them. The Manhattan routing engine handles the path automatically.