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 electronic symbols available in Circuit Diagram Maker. Every component follows common schematic conventions so your diagrams stay readable for engineers, students, and reviewers.
The library is organized into six practical groups covering passive parts, semiconductors, integrated circuits, power elements, connectors, and electromechanical devices. Use it as a quick reference while planning or reviewing a schematic.
Active & Semiconductor
Semiconductors enable switching, amplification, and signal processing. Circuit Diagram Maker includes standard symbols for common device types.
- Diode
- Zener Diode
- LED
- NPN Transistor
- PNP Transistor
- N-MOSFET
- P-MOSFET
Integrated Circuits
From analog op-amps to digital controllers, the IC symbols cover the building blocks most schematics depend on.
- Op-Amp
- Comparator
- Microcontroller
- Logic Gate (AND/OR/NOT)
- 555 Timer
- Voltage Regulator
Power Components
Map power distribution clearly and keep supply paths easy to inspect during design reviews and documentation work.
- Battery
- DC Power Supply
- AC Source
- Transformer
- Ground Symbol
- Voltage Rail
Connectors & IO
Interface symbols define where the circuit connects to the outside world and help make schematics production-ready.
- Header Connector
- Terminal Block
- USB Port
- Test Point
- Antenna
- Probe Point
Electromechanical
Control physical devices with electromechanical symbols for relays, switches, indicators, 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 reviews, handoffs, and documentation.
| Symbol | Category | Typical Use in Circuit Diagrams | Reference Designator |
|---|---|---|---|
| | Passive | Current limiting, voltage dividers, pull-up and pull-down networks | R1, R2, R_PULL |
| | Passive | Decoupling, filtering, timing, and coupling | C1, C_BYPASS |
| | Passive | Energy storage, filtering, and EMI suppression | L1, L_CHOKE |
| | Semiconductor | Rectification, protection, and clamping | D1, D_TVS |
| | Semiconductor | Status indication and illumination | LED1, LED_PWR |
| | Power | Load switching, H-bridges, and converters | Q1, Q_SW |
| | Analog IC | Amplification, filtering, and comparison | U1A, U1B |
| | Digital IC | Logic, sequencing, and communication | U2, MCU |
| | Power IC | Voltage regulation, LDO, and switching | U3, REG |
| | Interface | External wiring, board-to-board links, and IO | J1, J_USB |
| | Electromechanical | High-power switching and isolation | K1, RLY |
| | Electromechanical | User input and mode selection | SW1, SW_PWR |
How to Place Components in Circuit Diagram Maker
Open the Circuit Diagram Maker editor, browse or search the component library in the left sidebar, and drag a symbol onto the canvas. Each component snaps to the 20px grid for clean alignment.
Select a placed component and press R to rotate it. Use H or F to flip it horizontally or vertically, and double-click the symbol when you want to edit its label or reference designator.
Once your parts are in place, switch to the Wire tool by pressing W and connect pins point to point. The Manhattan routing engine keeps the wiring tidy automatically.