Product tests

NE555 DIY organ electronics kit

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

LED DMX-512 lamp teardown

Here is a tear-down of 36W Par LED PAR CAN Stage Light with IR remote and DMX-512 control from 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

2in1 Wireless and Wired Microphone

I got a very cheap wired/wireless mic  from 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

Testing NanoVNA

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

Micro Bit case

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

Component tester case

I had earlier built Original Hiland DIY M12864 Graphics Version LCR ESR PWM Transistor Tester Kit and used it successfully. The kit worked well, but on longer term use I felt that the lack of proper case for it was sometimes annoying. I had some time though if making my own case, but it felt