Circuits for Hobbyists - a Collection of Schematics to Build

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How Astable Multivibrator Circuits Work

The astable multivibrator circuit is a classic circuit for flashing two LEDs. It doesn’t have to flash two LEDs though. It can blink just one LED. Or it can create a tone to play on a speaker. First, let me show you the circuit in action: Want to know the theory behind how the circuit […]

Build an Atari Punk Console this evening

Do you want a fun and easy-to-build circuit? Here’s the simple, but fun Atari Punk Console – with schematics and parts list. It’s a quick build, so you can easily build it during an evening. It takes its name from the old Atari computers of the 80s because it makes similar sounds. And after my […]

Portable USB Charger Circuit

Build this portable USB charger circuit, and you’ll always have access to a charger. Imagine a beautiful summer day. You’re on your way to meet friends for a picnic in the park. But, the park is huge and full of people. Since you don’t know where exactly your friends are, you pick up your phone […]

Blinking Christmas Lights

Christmas is coming up, so why not set aside an hour or two to build this blinking Christmas lights circuit? This circuit is easy to build and it’s something you can put to use right away. I built this and hung it in the window, something my girlfriend loved! The blinking part of the circuit […]