Archive for February 2018

Direct Digital Synthesizer (DDS) (Part 9)

Part 1, 2, 3, 4, 5, 6, 7, 8, 9 Let’s go a few steps further in the direction of a fully featured arbitrary wave generator ! The early posts describe how to generate clean waves at various frequencies. In this post, I will explain how to offset the signal and how to attenuate it. Setting negative offsets requires… negative voltage ! Which Arduino  platforms do […]

Switch Mode Power Supplies (Part 2)

Part 1, 2, 3 Next picture illustrates the principle of operation of my proposal for an arduino controlled Switch-Mode Power Supply (SMPS): Instead of using an integrated chip, we will use arduino as a controller. The basic configuration requires an output line to drive the switch and two analog inputs for reading the voltage from the current […]

Memories from my first trips in Silicon Valley

As I was tidying my electronic components, I found an untouched plastic bag containing an DC that I bought a loooooooong time ago in San Jose. At this time, some friendly colleagues from SID (HP Scientific Instruments Division located in California Avenue) drove me to some great places around Palo Alto, including some electronic shops […]

Switch Mode Power Supplies (Part 1)

Part 1, 2, 3 This is the begining of a series of posts dedicated to an original subject that I had in mind for sometimes now. After few attemps, I decided to share my early design which might drive us up to building a versatile lead-acid battery charger. The aim of these posts is not […]