Rui Santos from Random Nerd Tutorials tipped us with his latest tutorial on how to build an Android app using the MIT App Inventor software that allows you to control the ESP8266 GPIOs: ESP8266 controlled with Android app (MIT App Inventor) -...

In this guide Sanket Gupta @ octopart.com explains how to select a resistor from a range of common resistor types. In this blog, we will explain all the different types of resistors, their merits and demerits, and popular applications. We have included some recommendations for...

Dual Motor L298 H-Bridge Control project can control two DC motors connected to it. The circuit is designed around popular dual H-Bridge L298 from ST. This board can be configured to drive a single motor with high current rating also. This can be achieved with the help of jumpers on...

phasenoise has posted his teardown of a cheap GPS Jammer. This GPS jammer generates a 1575.42 Mhz interference to prevent your GPS unit from receiving correct positioning signals. Generally, “jammers” — which are also commonly called signal blockers, GPS jammers, cell phone...

Michael Dunn has done three teardowns of the worst 12V adapters and what he found is interesting. Yes! Can you believe it? This board used to be in another adapter housing, or more likely, in an end-product. It seems Chinese manufacturing has sunk to a new low: repackaging used...

This instructable shows how to build a photovoltaic cell curve tracer using Arduino and OPA549S OPAMPS. This projects shows how to create an IV (Current and Voltage) Tracer that can be used to teach the electrical characteristics of a solar panel. This project was created as part...

Dilshan Jayakody documented his USB port base NPN transistor curve tracer project: Curve tracer is an electronic test instrument to analyze the characteristics of transistors and other discrete semiconductors. In this post we construct USB base curve tracer to analyze properties of...

James Lewis @ baldengineer.com discuss about switching regulator types and uses. A switching voltage regulator is one of my favorite circuits. In school, they were the first circuits I built where I understood how transistors worked. In fact, they were the first circuit I saw an...