TheCircuitDog

A practical reference library for electronics engineers, students and hardware enthusiasts.

What you will find

Calculators for common circuit relationships, original worked examples, and general hardware bring-up guides. Calculators run locally in your browser and do not require an account.

Limits and responsibility

We prioritize clarity, but engineering decisions depend on much more than a single equation: device ratings, startup conditions, component tolerances, PCB layout, thermal performance and applicable safety standards. This site is educational only, not a substitute for engineering verification.

For commercial equipment, follow your organization’s design-review and qualification procedures.