NodeMcu robot kit

I like  Internet of Things and robotics, so DIY NodeMCU Lua 2WD Open Source ESP8266 WiFi Smart Car Kit was a good match for this to test. DIY NodeMCU Lua 2WD Open Source ESP8266 WiFi Smart Car Kit is a WiFi RC smart car that is designed and developed based on ESP-12E from ESP8266. It

CodeBug dev board

There are already a lot of low-cost, small-sized developing cards that are as well as the development of the educational use of embedded projects. Let’s start with Arduino, Raspberry Pi, ESP8266 NodeMCU, BBC Micro:bit, .. and many other Dev Boards. But it seems that world needs another new educational development board: CodeBug. CodeBug is designed

Interesting signal generators

Function generator in an important tool in electronics laboratory. It allows to generate different types of electrical waveforms over a wide range of frequencies. Traditionally function generators have been built using analogue electronics. There have been special ICs that have been widely used for this: Exar XR2206 and the Intersil ICL8038integrated circuits can generate sine,

Component tester M12864

New version of famous component tester I tested some time ago has arrived. M12864 Graphical RLC/ESR Transistor Tester With AVR-ISP Socket MOS/PNP/NPN M328 is an an updated version of famous M168 component tester.  This new model can test all the same components as the earlier version, plus it can do for example in-circuit capacitor ESR

LED COB module tested

LED manufacturers continue to innovate to improve economies of scale. One of the newest packaging solutions designed to help lower costs is chip-on-board (COB) light source modules. COB (Chips on Board) , is a technology of LED packaging: Multi LED chips are packaged together as one lighting module. When it light up, it looks like

How to Buy a Multimeter

Are you planning to buy a multimeter and need help? Here are some timps How to Buy a Multimeter covers what you need to know to select a meter for DIY electronics. It focuses on the needs for audio electronics, but it’s purposely kept general in nature. Handheld Digital Multimeters are mainly used to measure

Car USB charger teardown

Here is a teardown of a cheap car USB charger (few us dollars). It worked well for years, but started to be unreliable one day. So I had to take a look what is inside: The issue seemed to be bad ground/- connection. A little bit of soldering could fix this.. Posted from WordPress for

Biltema grounded universal travel adapter

I bought this is universal travel adapter from Biltema to be able to connect my laptop power supply with grounded schuko plug hopefully safely to UK power outlets. Many other travel adapters only work well with ungrounded loads (typically either accept only ungrounded plug or leave ground not connected). This is one rare product that