1. Simulating Circuits Using QUCS, the Quite Universal Circuit Simulator
Doug Reece, AK4AO
May 22, 2015

2. About QUCS Free software!
Provides CAD tools for drawing schematic diagrams
Simulates the behavior of the circuit represented by the schematic DC AC
Frequency domain
Time domain
Digital logic

3. Uses for QUCS
Students/hobbyists: Experiment with various types of electronic circuits without components and lab instruments
Professionals: Analyze circuit performance before building
Caution: Models don’t capture all aspects of a real circuit: stray capacitance/inductance, hum pickup, etc.

4. DC Circuit: Voltage Divider

5. Voltage Divider with Parameter Sweep

6. AC Circuit – Frequency Domain

7. AC Circuit – Time Domain

8. Digital Logic Simulation

9. Some other QUCS Features
Libraries of real devices
Filter design
Attenuator design
Equations, including differential equations
Optimization

10. Resources
URL for software (MAC, Windows, various Linux flavors, source code)
Note: Windows version loads several programs
Tutorials: