Can we fix a dead nebula projecting spaceman?
This unit is completely different from the other unit I looked at. It has different circuitry and a very odd…
High power ultraviolet led experiments
Some experiments to see how a selection of series capacitors affects the power dissipation and output of a 50W near-ultraviolet…
Inside a weird rechargeable silica gel dehumidifier
This very stylish dehumidifier branded Prem-I-Air (not a sponsor) consists of a base that blows a gentle stream of hot…
Speed camera stealth jammer teardown – with schematic
A very affordable device that jams any speed or red light camera, allowing you to floor it at all times…
2032 lithium cell charger with reverse polarity test
These USB powered chargers are only suitable for charging the LIR2032 rechargeable versions of the lithium button cells. Do not…
Inside a bumble ball – with schematic
The circuitry in this toy was more sophisticated than I was expecting. Mainly for safety and electrical interference reasons. These…
Fixing twinkly festoon issues – interesting power and data system
Twinkly is a prominent brand of addressable LED lights that can be used with simple controllers or pixel mapped with…
How to use the xh-m452 temperature and humidity module
This very common general purpose module has two sections - temperature and humidity. Each section has its own volt-free relay…
Very rare british juggler bubble tube
The tube is mounted in a 3D printed adaptor for an LED bulb.
Temu everlasting pencil test not sponsored
The everlasting pencil, also known as the infinity and eternal pencil is a novel writing/drawing device that uses changeable tips…