Circuits for Hobbyists - a Collection of Schematics to Build

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.


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More Circuits:

The Useless Halloween Machine

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 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.

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.

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 […]

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!