Fiber optics power meter

An optical power meter (OPM) is a device used to measure the power in an optical signal. The term usually refers to a device for testing average power in fiber optic systems. Power meters are part of the toolbox essentials for all technicians installing or maintaining any type of fiber networks. They are used to

DMX-512 decoder for RGB LED

I have earlier written on using DMX-512 controlled dimmer to control mains powered lamps. It works, but is expensive and traditional incandescent lamps are going out of fashion. LEDs are the future, so a cheap easy to use board for controlling low voltage LEDs with DMX-512 signal are needed. To experiment with LED conrolling I

USB C adapter sales claims

Just when micro USB became the standard way to charge smart phones, new standard emerged: USB type C. Again you need new chargers… Is there a way to reuse old chargers? Yes. There are USB C to micro USB adapters that allow new phones charged with old chargers (works but at slower speed). I needed

Function generator kit

A function generator is usually a piece of electronic test equipment or software used to generate different types of electrical waveforms over a wide range of frequencies. Some of the most common waveforms produced by the function generator are the sine, square, triangular and sawtooth shapes. Function generators are used in the development, test and repair

Cell phone charger

I have used some for time Barkan PB22B 2200mah Portable Charger Black to charge my smart Samsung S4 mini phone. I had some issues first that the charging was not reliable with my phone (worked well with some other devices). I decided to look what was wrong with USB Power Current Voltage Tester, and with

Sonoff IoT swich

DIY Wi-Fi Wireless Switch For Smart Home With ABS Shell Socket Remote Control Switch Module is an IoT home automation device. This device, also known as Sonoff from ITEAD, can control 110V to 230V AC mains power on/off (up to 7A or 10A depending on document). The switch is controlled with mobile app (or local

Tube preamp kit FE-6J1-2.0B

A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. In audio applications, valves continue to be highly desired by most professional users, particularly in recording studios’ equipment and guitar amplifiers. Among stereo enthusiasts, there is a subgroup of audio

SilverCrest SWS-A1 IoT power outlet

SilverCrest SWS-A1 is an IoT controlled electrical outlet device sold by Lidl.  It connects to home Wifi network and that can be controlled with smartphone app anywhere where you have Internet connection. Silvercrest app allows to control the electrical outlet on and off (ON is meaning contact the power between electrical appliance and power supply.

Qi charger board analysis

I have written several postings on Qi wireless power. To get a good idea how Qi really works, I bought cheap bare Qi charger board Qi Wireless Charger PCBA Circuit Board + Coil Charging (costs only slightly over two Euros / USD).Qi Wireless Charger PCBA Circuit Board + Coil Charging kit consists ofQi Wireless Charger