cat4

The best resource for tech and electronics projects, tutorials and reviews

Latest Posts

Gweike G2 Pro 30W Fibre Laser Unboxing & Review

Michael Klements - November 13, 2024 0

I've been using diode and CO2 lasers in my home workshop for quite some time. Combined with a 3D printer, they've been fantastic for...

Khadas Mind 2 Unboxing & Review

Michael Klements - October 31, 2024 0

Over the past two years, I've tried two of Khadas' single board computers which were aimed at being compact and low power computers for...

Elegoo Mars 5 Ultra Unboxing and Review

Michael Klements - October 23, 2024 0

The Mars 5 Ultra is the latest revision to Elegoo's successful Mars series of SLA printers. Its product page advertises an impressive set of...

I Built A 4-Bay Raspberry Pi 5 Based NAS

Michael Klements - May 15, 2024 24

Last year, I built a Pi-based NAS as cheaply as possible using a Raspberry Pi Zero 2W. It was a great project to learn...

Recondition a Lead Acid Battery, Don’t Buy A New One

Michael Klements - May 12, 2016 146

Lead acid batteries often die due to an accumulation of lead sulphate crystals on the plates inside the battery, fortunately, you can recondition your...

Multiple Push Buttons on One Arduino Input

Michael Klements - May 17, 2019 29

The most commonly used Arduino board, the Arduino Uno, only has 12 available digital IO pins, so you may find yourself quickly running out...