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 Timers The idea for this project came after we published the simple 555 PWM circuit […]
How do you become better at electronics? By building lots of circuits.
On this page, you'll find circuit diagrams for a wide range of fun and interesting electronic circuits:
Transistor circuits. 555 Timer Circuits. LED Circuits. Amplifier circuits. And many more.
All circuits come with a component list and a connection diagram, schematic, or build instruction. So you can just start building right away.
If you have any questions about the circuits, just ask in the comment section of the circuit you're curious about.
Featured Resources:
More Circuits:
How to Build a Touch Sensor Circuit
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 this circuit if you’re a total beginner. The Touch Sensor Circuit Diagram You only […]
Baseball Game with 5-Run Display
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 available and inexpensive digital ICs in the 4000 CMOS series along with some passive components.
How To Build A DIY Sugar Dispenser
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 machine dispense sugar.
How to Make a Dual 5V Power Supply From USB
In this guide I’ll show you how to build a +5V -5V dual power supply from a standard USB outlet, using just four components. It’s a simple circuit that only requires four different components. And you can easily build it at home on a prototyping board.
How To Measure Water Tank Depth Using Ultrasonic Sensor
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 things that some people don’t like getting into just because it sounds complex to use and understand. […]
Build a Cool Christmas Tree Ornament in 5 minutes
Do you want to build something on your own for Christmas, but don’t have much time? Or no experience? Then this project is for you. One of the easiest ways to make a Christmas circuit that looks cool when you don’t have much time is to use a color-changing LED. A color-changing LED looks like […]
Halloween Electronics Project: Jack-O-Lantern
In this Halloween electronics project, I’ll show you how to make a cool Jack-O-Lantern. I used a 3D-printed carved pumpkin, but a real one works just as well (or even better!). The project is based around three normal LEDs that I control so that they look like a flickering flame. Since my “pumpkin” was very […]
The Sunrise Wake-Up Alarm
In this tutorial, you’ll learn how to build an sunrise wake-up alarm. It’s a light-sensitive circuit that will activate a buzzer when you have light shining directly on it. Place it in your window at night and the alarm will activate in the morning when the sun rises.
Circuit Ideas And Where To Find Them
Circuit ideas are everywhere! There are many places to find cool circuits.
The greatest sources for my inspiration are hacker/maker/electronics blogs, schematic webpages, hobby project pages, and open-source hardware companies.
How To Build An Automatic Night Light Circuit
In this tutorial, you’ll learn how to build an automatic night light circuit that turns on when it gets dark. It’s a simple circuit that you can build on a breadboard. This circuit shows you how to do it with an LED. But you can use the same principle to turn on bigger and brighter […]
How to Build an Arduino Theremin
In this short tutorial, you will learn how to build an Arduino Theremin. You only need three components plus the Arduino, wires, and breadboard. Use the breadboard diagram or the video below to see how to connect everything.
Simple VU-Meter Circuit
I put together this Voltage Unit (VU) meter using LEDs on a breadboard the other day. It only has 4 LEDs, but can easily be expanded to more: It’s basically a simple display for showing a value. It’s originally for showing signal level in audio circuits, but there’s no reason you can’t use it to […]
Build Instructions: The Blinking Light Circuit
Do you want to build a circuit that blinks a light? This inverter-based circuit is simple, and it’s small enough to fit on a breadboard. The circuit uses standard basic electronic components and you can build it even if you have never built anything before. Check out the full build instructions in the video below: […]
What Is an H-Bridge?
An H-bridge is a simple circuit that lets you control a DC motor to go backward or forward. You normally use it with a microcontroller, such as an Arduino, to control motors. When you can control two motors to go either forward or backward – you can build yourself a robot!