Browse our free electrical engineering textbook by product (power electronics, capacitors, inductors, and more). Great for students, makers, and professionals who are looking to refresh or expand their knowledge on a specific subject. These textbooks were originally written by Tony R. Kuphaldt and released under the Design Science License. It has since then been updated by members of the All About Circuits community and editorial team.
Learn about the path for the flow of alternating current (AC).
Amplifiers are an electronic device or circuit which is used to increase the magnitude of the signal applied to its input.
An attenuator is an electronic device that reduces the power of a signal without appreciably distorting its waveform. Learn more about them here.
Learn about binary numbers and how they are expressed in the base-2 or binary numeral system.
Boolean Algebra is used to analyze and simplify digital (logic) circuits.
These passive electronic components store electrical energy in an electric field. Read more about them here.
Combinational logic is a type of digital logic which is implemented by Boolean circuits, where the output is a pure function of the present input only.
Electronics connectors are an electro-mechanical device whoes purpose is to quickly and easily disconnect or interrupt a circuit path. Learn more here.
Used in digital electronics for counting purposes, these can count specific events happening within a circuit.
Mostly used in low voltage applications, the closed path in which direct current flows is called a DC circuit.
The diode performs a variety of useful functions related to its core purpose of managing the direction of the flow of electrical current.
Learn more about the relationship between electricity and magnetism, and its role in electronic components.
A filter is a circuit capable of passing (or amplifying) certain frequencies while attenuating other frequencies. Learn More.
Inductors are a passive component that stores energy in a magnetic field when electric current flows through it.
Learn about contactors, protective relays, relay construction, and solid-state relays here.
Gain a deeper understanding of logic gates and how they make logical decisions based on the combination of digital signals presented on their inputs.
A section to learn more about miscellaneous circuits like 555 schmitt triggers, rheostats, alternators and more.
Operational Amplifiers (op-amps) are a voltage amplifying device designed to be used with external feedback components such as resistors and capacitors.
Oscillators are an electronic circuit that produce periodic, oscillating electronic signals, often a sine wave or a square wave.
Learn about the application of solid-state electronics and thier role in the conversion of electric power.
Learn more about the different types of power supplies: unregulated, linear regulated, switching and ripple-regulated.
RC network (resistor–capacitor network), is an electric circuit composed of resistors and capacitors driven by a voltage or current source.
Resistors are a passive electrical component that create resistance in the flow of electric current.
Learn more about the type of logic circuits whose output depends not only on the present value of its input signals but on the sequence of past inputs and the input history as well.
This section covers topics around digital communication systems, data flow, microprocessor programming and more.
Transformers are designed to convert alternating current (AC) from one voltage to another.
Transistors are a device that regulates current or voltage flow. Learn more about how they act as a switch or gate for electronic signals.
Often called a "Function Generator", a Waveform Generator is a device or circuit that produces a variety of different waveforms at a desired frequency.
Learn about the various types of motors and how they play a role in things like robotics and electric vehicles.
Learn about the importance of electrical safety and the common sources of hazard.
Learn about the equipment used to create signals and capture responses from electronic devices.
Devices that detect and respond to some type of input from the physical environment.
Circuit simulation uses mathematical models to replicate the behavior of an actual electronic device or circuit.
Gain an understanding of electromechanical relays and solid-state relays, and how they differ from switches.
Semiconductors are essential for many electronic appliances as well as for social infrastructure that support our everyday life.
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