These miniature metal detectors cannot boast of any great sensitivity, but it would still be good to make them for any enthusiast in this field, especially because of the opportunity to study in detail the way such devices work.

Despite the many options and customization possibilities, this device is extremely simple to build, and contains a minimal number of components.

Simple way to turn this module into a really functional and cheap PEMF device that is usually sold at a very high price.

A simple way to build a quality multiband receiver using a specialized radio chip.

This is a custom version of the Hunter game with 10 LED and LCD display to show the score, followed by various sound effects.

Overview of the basic properties and characteristics as well as a detailed description of the internal components.

This is a very original, effective, and interesting example of a safe lock, which is almost identical to the large factory safes.

A simple and relatively inexpensive way to make an efficient DRSSTC (Dual Resonance Solid State) Tesla coil.

Unusual Retro clock that shows the time on retro displays made by Hewlett-Packard at the turn of the last century.

An extremely simple way to make a stand-alone quality SDR radio with professional capabilities and features.

A relatively simple and inexpensive way to make this device that is often used in alternative medicine.

An interesting open source Arduino + 3D Print project uses gyroscopic sensors and accelerometers to detect the movement of the balanced object and adjust the speed and direction of the wheels accordingly, allowing to control the device through shifts in their weight