Example circuits

Circuits you can open and run

Each example is a real, solvable circuit — not a screenshot. Open one in the simulator and the numbers you see are what the analysis returns.

Fundamentals

A single resistor across a 9 V battery — the cleanest demonstration of V = I × R.

Why an LED needs a resistor — and how to size it for a target current.

Two equal resistors split 12 V into 6 V — the workhorse of analog design.

Three resistors in a line add up — same current everywhere, voltages that sum to the supply.

Two 1 kΩ resistors in parallel behave like a single 500 Ω — currents add, voltage is shared.

A capacitor charging through a resistor — the classic exponential, plotted on the scope.

A pulse source drives an LED through a series resistor — watch it blink on the scope.

A single diode clips negative half-cycles — the simplest AC-to-DC conversion.