Insect repellent (ART608E)

Certain types of insects that "bite" humans, such as mosquitoes, midges, curassows, or whatever they are known as in various regions of Brazil, cannot tolerate certain continuous sounds of certain frequencies. Based on this fact, we describe a sound emitter that disturbs certain insects and can function as a repellent.

Experimental Passage Alarm (ART598E)

The presented circuit, which is easy to build, triggers a relay when the light falling on the sensor is interrupted. There are several possible applications for this experimental alarm. We can use it to demonstrate how a photoelectric sensor (LDR) works, turning on lights when it gets dark or detecting the passage of people, or we can use it in a power grid outage alarm. The circuit is battery powered and easy to build.

Power supplies, drivers and other KNX-compatible devices from MEAN WELL (ART596E)

Over the last decades, Mean Well has become one of the most recognisable global providers of power supply modules and converters. However, its product range also includes a broad selection of other solutions, such as KNX equipment for building automation systems.

Dark-Activated Fluorescent Lamp Flasher (ART061E)

This circuit turns on automatically at dusk and off again at dawn. It can be used in visual alarms and “attention getters” in commercial advertising.

How to build a workbench (ART593E)

Note: This article is part of our book Build a Electronics Workbench

After considerations about everyone's work with electronics, the choice of location and other important factors that will determine how you should choose your bench, we finally arrived at it.

Welding, welder and welding accessories (ART594E)

We could include the welder in the category of tools, but its importance is such that we prefer to talk about it separately. We will not go into detail about welding techniques or how a welder works, as they are not part of our objectives with this book