Circuits & Projects

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.

The Simplest Amplifier Circuit Diagram

I have been looking for a good stereo amplifier circuit diagram for a long time. I am not a HiFi geek, I just wanted to build a simple stereo amplifier that could drive some speakers for my desktop computer.

stereo-amplifier-board-layout

All the schematic diagrams that I could find seemed to involve lots of hard-to-find components or you had to use it together with a pre-amplifier or some other amplifier stage. It was always something that made me hesitate.

But recently I found this awesome little chip called TEA2025! You only need a few capacitors to make a decent stereo amplifier out of it. It is so simple to build that I put it together on a stripboard in just a few hours.

Recyclomat – the Rube Goldberg Recycling Machine

Here is a really cool and huuuge recycling machine we built for a music festival in 2010. It is an interactive recycling station. The idea was to make recycling fun.

When you put garbage in it, the machine detects it and moves the ball on the left side one step up. When the ball has made its way all the way to the top, it is released down a pinball-ish slope while a “Tivoli” kind of tune is playing with lots of blinking lights.

The machine was on display for the first time at Øyafestivalen 2010 in Oslo. It was a real hit! Lots of people came by and recycled their garbage to get the ball to the top. People even picked up trash from the ground to put in it =)

In the following video, you can see it in action at Øyafestivalen. Elias (from thing-printer.com) is pretending he doesn’t know what it is and asks one of the girls who work there how to use it.

Radar Circuit Examples

There are so many cool things you can make with mini radar circuits. I thought I’d share some examples from my time in the radar business. Then end with a few examples of where you can get a hold of a radar circuit.

Just to be clear: A radar is a sensor that uses electromagnetic waves for sensing. This is NOT ultra-sound. This is the real deal.

PCB of our D1 Radar Circuit (With antennas)

5 Really Cool Circuit Ideas For Your Next Electronic Project

Here are 5 cool circuit ideas for your next project. It feels so good to make cool stuff. So here is some inspiration for you to start building your next project.

An old radio hacked into an iPhone dock

This is a project I did that was really cool to make.