How to build a digital coil-less (100KHz step size) FM transmitter

By Hesam Moshiri, Anson BaoAn FM transmitter is one of the most popular devices between electronic hobbyist, professionals and even non-technical people. In this article, we gonna learn to how to build an easy, stable and digitally controllable FM transmitter.For this design, I have selected the VMR6512 module which truly is like a full RF block on a chip!. It eliminates all essential circuitry for a basic FM transmitter such as inductors and trimmers. According to the VMR6512 datasheet: “VMR651...

FM transmitter digital coil-less

How to make a noise-free infrared obstacle detection

By Hesam Moshiri, Anson BaoAn obstacle detection unit is an essential part of a variety of projects, such as robotics and security applications. The infrared sensors are widely used for these types of applications. The main drawback of some circuit designs is that the detection units are sensitive to the outside lights and react unstable or noisy.In this project, we selected a proper IR receiving component and designed the circuit in a way to act as stable as possible. Also, you can adjust the s...

noise-free infrared obstacle detection

How to make a variable step-down DC to DC converter using TPS54331

By Hesam Moshiri and Anson Bao.Almost in any circuit design, building at least one regulation stage is necessary. Two power supply design options are available, which are linear and switching. The linear regulators are easy to build but inefficient, especially when there is a high difference between the input voltage and the desired output voltage. Also, by increasing the regulator output current, the efficiency also decreases. Both of these problems are easily visible in terms of heat dissipati...

DC to DC

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