This page is a section of Ultimate Electronics: Practical Circuit Design and Analysis, a free, online, interactive electronics textbook by Michael F. Robbins.

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Chapter 1 Example Circuits

Click any circuit to open in a new tab. Most include simulations.


From Algebraic Approximations:

Plotting Tangent Line Approximation

Midpoint Tangent, Endpoint Interpolation, and Linear Least Squares


From Orders of Magnitude, Logarithmic Scales, and Decibels:

Log-Log Plotting Approximations


From Complex Numbers:

RC Low-Pass Filter as Complex Number Multiplication


From Linear & Nonlinear:

Multiple Linear Equations

Multiple Linear Equations - Frequency Domain Shows Slopes

Multiple Linear Equations with Sine Wave Input

Multiple Linear Equations with Two Sine Wave Input

Multiple Linear Equations with Multiple Additive Inputs

Newton-Raphson Method Example

555 Adjustable PWM with RC Filtered Output

555 Voltage Controlled Oscillator (VCO)


From Systems of Equations:

System of Two Linear Equations

System of Two Linear Equations - No Solution


From Steady State & Transient:

Inrush Current Spike when Switching Capacitive Load


From Lumped Element Model:

Lumped Element Model of Spring-Mass-Dashpot Mechanical System

Lumped Element Model of Spring-Mass-Dashpot Mechanical System with Laplace Blocks

Lumped Element Model of Spring-Mass-Dashpot Mechanical System with Laplace Blocks (Parameter Sweep)


From Thermodynamics, Energy & Equilibrium:

Thermal Modeling: Electric Hotplate and Skillet Warm-Up

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