Amazing board with volume and tone controls and a distortion fuzz integrated with activated/deactivated on demand; complete with a speaker and a power supply, it constitutes an essential tool for guitar exercises. Who likes to play electric guitar, unfortunately, knows that this instrument, unlike its acoustic alter ego, hasn’t a sound box: you can…
Designed to be coupled to an irrigation controller, a weather station or motorized curtains and rolling shutters, it shuts down a relay when rain is detected. One major issue when dealing with sprinkler controllers is rain starting to pour during sequences execution, because in this case it is useless – if not damaging…
Let’s create an electrically controlled lock that is opened by means of an always different code that is generated by our smartphone, on the basis of an algorithm that takes the time into account. If you are a customer of an online bank, you will probably be using a device named “token” already,…
Let’s create a new evolution for our 3Drag printer, with a dual extruder for the printing of chocolate items of two types or colours. The 3Drag printer has been our answer to the growing need – on the part of the general public (a need that was already shown towards the RepRap project) –…
A tech Christmas decoration, created by means of Neopixel LEDs and controlled via an Arduino Micro board, that takes up a minimal amount of space. With the Xmas holidays approaching, we always try to propose a solution or another, one that is capable of combining tradition and innovation, so to avoid the usual or…
A compact stereo amplifier that may be used at home as well as in the car, and also to substitute broken audio power amplifiers or to create bench power amps for the analysis of audio devices. When repairing audio devices, it is always useful to have a BF amplifier on your workbench; all the…
Let’s see how to use this shield along with Raspberry Pi, by means of a dedicated library. In the last installment we gave readers description of a new RTCC shield, based on the MCP79410 integrated circuit, by Microchip just after having presented the sketch for Arduino; now, as anticipated in the first installment,…
Let’s use a new Real Time Clock by Microchip, by making it available on a shield for two prototyping boards. First Installment. Many applications require an hourly information, that is locally obtained by means of circuits that are named RTCs (Real Time Clock) or RTCCs (Real Time Clock Calendar); among them are clock…
When inserted in the cigar lighter socket, it signals the electrical system’s voltage level by means of a bi-color LED. Especially in the cold season, knowing the battery voltage, when the engine is off, allows us to prevent unpleasant inconveniences, such as a failed engine start; in fact the voltage really makes a…
Having explained the theory, let’s see in practice the project of the SEPIC power supply. In this post we discussed – on a theoretical level (even if in a simplified way) – the SEPIC switching converters, also highlighting advantages and disadvantages, and giving you the basics for the calculation of their components. Let’s…
The SEPIC configuration, a very useful one, is used in modern converters for mixed supply systems. Thanks to the availability of an always growing number of specialized integrated circuits that realize – with the help of very few external components – some complete and valid voltage regulators, today the switching technology is the most…
The possibility to transfer electric power by means of electromagnetic waves was proved for the first time by Nikola Tesla, in 1890: he probably could not imagine how the discovery would have been appreciated nowadays. Standard Qi and wireless charge are terms that overwhelmingly entered the consumer sector, and in particular as for…
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