Diodes & LEDs

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Electronics Projects: How to Use LEDs to Detect Polarity

In this project, you build an electronic gadget that uses two LEDs to indicate the polarity of an input voltage. The voltage is provided by a 9 V battery connected to the circuit via a DPDT knife switch [more…]

Electronics Basics: What Is a Semiconductor?

Semiconductors are used extensively in electronic circuits. As its name implies, a semiconductor is a material that conducts current, but only partly. The conductivity of a semiconductor is somewhere between [more…]

Electronics Basics: P-N Junctions

By themselves, P-type (positively charged) and N-type (negatively charged) semiconductors are just conductors. But if you put them together on an electronic circuit, you create a [more…]

Electronics Components: Diodes

A diode is an electronics component made from a combination of a P-type and N-type semiconductor material, known as a p-n junction, with leads attached to the two ends. These leads allow you to easily [more…]

Electronics Components: Types of Diodes

Diodes come in many different flavors. Some of them are exotic and rarely used by electronics hobbyists, but many are commonly used. The following describes three types of diodes you're likely to encounter [more…]

Electronics Projects: How to Use a Diode to Block Reverse Polarity

Although diodes look a little like resistors, they behave very differently in electronic circuits. Diodes have one ability that sets them apart: They let current flow freely in one direction, but block [more…]

How Rectifier Circuits Work in Electronics

One of the most common uses for rectifier diodes in electronics is to convert household alternating current into direct current that can be used as an alternative to batteries. The rectifier circuit, which [more…]

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