CircuitLab lets you create, test, and share schematics in your browser CircuitLab is a free, web-based tool for creating schematics: it’s dead simple to place resistors, capacitors, batteries ...

CircuitLab is coming up on its one year anniversary, and the startup (now part of Y Combinator's winter 2013 cohort) now boasts 70,000 monthly active users, who run an average of one circuit ...