PoE powered device PSU

With PoE (Power over Ethernet) technology, an Ethernet cable can carry power in addition to data. PoE can supply operating voltage to PoE compatible networked devices, such as a WLAN base station, an IP camera, a VOIP phone or IoT device. The original IEEE 802.3af-2003 PoE standard provides up to 15.4 W of DC power

Hakko 191 soldering iron meter

I got this “Hakko 191″ soldering iron temperature meter from Banggood some years ago. It is not available there but you could find similar devices from eBay etc.. According to Hakko official pages the model 191 TIP THERMOMETER has been discontinued maybe years ago. This is most probably some Chinese clone of the device because

SMD soldering videos

SMD stands for Surface Mount Device and they are components that you solder on the surface of a circuit board.Soldering them is somewhat different from soldering “traditional” through hole mounted components. There are many SMD soldering tutorials, for example How To Do SMD Soldering Using a Soldering Iron and Sparkfun Surface Mount Soldering Tutorials. Youtube

Soldering iron videos

I have earlier posted about soldering irons. Here is a continuation to it with a set of interesting soldering iron tear-down and DIY videos from YouTube. Inside the cheapest soldering iron on ebay. How To Make a MINI USB Power Soldering Iron Hot! Hot! Hot! Weller ROBUST Soldering Gun, BEB #21 Homemade Soldering Gun How

Cheap USB soldering iron tested

I have earlier written about USB soldering iron and DIY USB soldering iron. The question is that how useful they are because of the limited power available from USB port (just few watts). The maximum power you can get from normal USB 2.0 port is only 2.5W (5V 500mA), but some special “charge” USB ports

BG7TBL RF noise source

I have played with software defined radio using cheap DVB-T stick for some time. Receiving radio transmissions is interesting, but it works also for other applications. By reading RTL-SDR Tutorial: Measuring filter characteristics and antenna VSWR with an RTL-SDR and noise source article I understood that I could use my RTL-SDR stick for many RF

Solderless breadboards

Solderless breadboards are one of the most fundamental pieces when learning how to build circuits and prototyping simple circuits. A breadboard is a construction base for prototyping of electronics. Breadboard are the ideal way to check out small bits of circuitry that you’re not sure about. Originally it was literally a bread board, a polished

DC-4.0GHz RF Fixed Attenuator

RF attenuators are a universal building block within the RF design arena. I neeeded some RF attenuators for my electronics lab. I found this cheap product  DC-4.0GHz RF Fixed Attenuator from Banggood. They seemed to have pretty good specfications and features considering that the price is just slightly over 7 Euros for three attenuators: Frequency

The quest for a great text editor: A brief intro to Notepad++ Question “Vim or GNU Emacs?”  From those my answer is Emacs. But more and more I use other editors. One of my favourites on Windows is Notepad++. Notepad++ is easy to install, licensed under the GNU Public License (GPL), and the source is available on GitHub.  If you’re comfortable with Windows Notepad or WordPad, the Notepad++ interface will be

Fiber optic testing updates

Few days ago I read The remarkable evolution of modern fiber-optic connector inspection probes article tells about the current state of fiber inspection. Especially with multifiber connectors such as MPO, MT, and MXC microscopic connector endface dirt and debris cause light reflections and attenuation – the enemies of optimal optical signal transmission. Thankfully there now