CircuitLab is designed to be a "virtual electronics lab" that bridges the gap between theory and physical prototyping. CircuitLab: Online circuit simulator & schematic editor

Many universities provide free access to the CircuitLab Student Edition through site-wide licenses. If your school is a member, you can sign up for a free account using your official student email.

You can try the schematic editor and simulation tools without creating an account. Simply open any example circuit and click "Open in editor" to start building.