Years ago you had to either build your own signal generator or buy usually a quite expensive signal generator. Lately there has been a push for very cheap ($15-25) digital function generator kits available from China. I wrote about some interesting function generator devices few years ago, and here is a closer look to one →
In this article I take a look at TU04 USB audio mixer, also known with many other names names like Teyun A4. This mixer can be found on many discount sites like AliExpress, Banggood, DHgate and Wish.com at low price ($30-50). For the price this audio mixer seems to offer quite a lot of features: →
It is pretty easy to do soldering ….Apply some flux, Heat the surface and apply solder .But when it comes to soldering SMD components it requires a little bit of skill and some tools and accessories. Industries use re-flow ovens with temperature profile Control to mass produce circuit boards. If you don’t have re-flow oven, →
To introduce a kid to electronics I ordered DIY NE555 Electronic Organ Teaching Kit kit from Banggood (cost around 3 Euros). They sell also many other similar kits, but this seemed to be good quality at decent price (around 3 Euro). There was not much information on the product page other than product picture, circuit →
happen to own IKEA Bekant motor adjustable table. It worked nicely for around years, and served well as my working table. Though there are only simple “Up” and “Down” buttons installed by default, it works OK. But one day I found out that some day moving the table up and down did not work anymore. →
Here is a tear-down of 36W Par LED PAR CAN Stage Light with IR remote and DMX-512 control from wish.com sale. The light works well with DMX-512 control. Front and back On the back there are XLR3 DMX-512 connectors, address display and control buttons. Look inside On the left there is aluminum circuit board with →
Here is a tear-down of a very cheap DMX-512 controlled LED light from Wish.com. It promised four colors (R, G, B and white) with 15W power and DMX-52 controlling. It has some reliability issues so I decided to take a look inside. Here are some pics of the product first. What is inside? Opening few →
I got a very cheap wired/wireless mic from Wish.com. I plan was to have a cheap “disposable” microphone for uses where I don’t want risking the more expensive microphone. Basically the product looks OK. The construction is plastic, but till feels acceptable for the price (less than 10 Euros on sale). If I get this →
NanoVNA is very tiny handheld Vector Network Analyzer (VNA). A vector network analyzer (VNA) is an instrument that can be used to measure antenna or coax parameters such as SWR, impedance and loss. It can also be used to characterize and tune filters. It is a very useful tool to have if you are building →
The Micro Bit is an open source hardware ARM-based embedded system designed by the BBC for use in computer education for use in UK. It’s use has spread to many other countries as well. It is a quite nice Bluetooth IoT experimenting platform with low barrier of entry to programming. I have few years ago →