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This year’s Halloween project is a useless machine built with 555 timers. It’s a coffin with a switch. When you flip it off, a dark force rises from the coffin and flips it back on. Controlling a Servo with 555...

A Half Adder is a digital circuit that adds binary numbers. In this tutorial, you will learn how it works, its truth table, and how to implement one using logic gates.  A Half Adder Circuit What is a Half Adder? A...

A NOT gate (or inverter) is a logic gate where the output is the opposite of the input. So you can say that the output is NOT the same as the input. It’s often called an inverter since it inverts the input. The...

A NOR gate is a logic gate where the output goes HIGH (or “1”) only if all its inputs are LOW (or “0”). The schematic symbol for a NOR gate is like the OR gate, just with a circle at the output to indicate that...

An OR gate is a logic gate where the output goes HIGH (or “1”) if any of its inputs are HIGH. So if A OR B is HIGH, the output Q also becomes HIGH. The logic or Boolean expression for an OR gate is which...

A NAND gate is a logic gate where the output goes LOW (or “0”) only if all its inputs are HIGH (or “1”). The schematic symbol for a NAND gate is like the AND gate, just with a circle at the output to indicate...

The XOR gate is a logic gate where the output goes HIGH (or “1”) if one – and only one – of its inputs are HIGH. XOR stands for Exclusive-OR. Check out its symbol and truth table below. The logic or Boolean...

An XNOR gate is a logic gate where the output goes HIGH (or “1”) only if both its inputs are equal. So if the inputs A and B are both HIGH or both LOW, the output Q will be HIGH. The logic or Boolean expression...

Ohms law is a simple formula that makes it easy to calculate voltage, current, and resistance. You can use it to find what resistor value you need for an LED. Or to find out how much power your circuit uses. And much...

If you are into baseball and would like a challenging ‘real-playing action’ baseball game, typically to exhibit your pitching skills, then you might like to construct this one. It is designed around four easily...

In this tutorial, you’ll learn how to build a 555 PWM Circuit. The 555 timer is one of the most popular integrated circuits for hobbyists. And one of the cool features is its ability to produce a PWM signal. The...

In this project, you will build a touch sensor circuit. It’s a cool and simple circuit that allows you to control an LED with the touch of a finger. And you only need three components, how cool right? You can build...

In this guide, I’ll show you how to build a DIY sugar dispenser using parts made of cardboard. By making the parts out of cardboard, it’s quick and easy to build and experiment with different ways to have your...

In this guide, I’ll show you how to build a dual +5V -5V power supply from a standard USB outlet. Dual power supplies with a negative output taken from the positive output can be a little tricky. It’s not a matter...

In this tutorial, you’ll learn how to use an ultrasonic sensor. Specifically, you’ll learn how to use the HC-SR04 module with an Arduino to measure the depth of a water tank. An ultrasonic sensor is one of those...

In this episode, we talk about operational amplifiers (opamps) and the 4000 series IC that Øyvind has been writing a series of posts on. We also accidentally came across a funny error on Arrow’s website . Listen to...

A year of learning and building electronics can take you from knowing nothing to being able to build pretty advanced projects. Is there someone in your life that is (or could be) interested in electronics? We are now...

In this mini-course, you’ll learn how to use a multimeter to take current, voltage, and resistance measurements. A multimeter is a tool you’ll be using frequently for troubleshooting, testing batteries, and a...