A network analyzer is an instrument that measures the network parameters of electrical networks. Today, network analyzers commonly measure s–parameters. Full featured network analyzers are expensive instruments, and sometimes a simpler. Scalar Network Analyzer (SNA) is a simpler form of RF network analyzer that only measures the amplitude properties of the device under test. SNA is →
Here is a simple diode detector for RF signals. I can feed RF signal from left and get DC output from right. The DC output can be fed to Arduino analog in. The diode in the circuit is germanium diode for low voltage drop. The circuit works well for fractions of volts to several volts →
A new electronics on-line component shop has opened in Finland at http://www.tronics.fi/. The shop has a selection of Arduino and Raspberry Pi related products. It has also selection of accessories, components and measurement instruments. The shop was opened few days ago. I have not ordered anything from the shop, but it looks good. The shop →
I have already written a few posts on AD9850 DDS testing. Here are some more testing. I had possibility to test my signal generator circuit with Rigol DSA 815 RF spectrum analyzer. I improved my test circuit from previous tests by putting it inside case. I also replaced Arduino UNO with Arduino model with FTDI →
Few days ago I tested AD9850 DDS module in home in hope to some day have a working signal generator using it. The initial tests went well, so I could plan the next step. I was already doing some information searching to make decision if I should do the controlling using web interface (with Ethernet →
For some RF tests I sometimes need to generate different higher frequency signals than normally available from general purpose function generator. For this purpose I bought a cheap AD9850 module to generate different frequency RF signals. This AD9850 module can generate frequencies in 0-40 MHz frequency range (sine wave output). For initial testing I successfully →
Nowadays you can find many low-cost microcontroller devboards (starting from just few dollars/euros). More recently, we’ve seen ARM Cortex kits for $10-$50, the flowering of the whole Arduino ecosystem, and of course, the Raspberry Pi. It’s microcontroller heaven with very many dev boards available. You you want more performance, there is a wide selection of →
It’s that time of the year again, and the halls are being decked with trees, the trees covered in lights. You know holiday season is getting close when the Christmas light projects start rolling in! Christmas is almost here so it’s time to kill a tree, set it up in your living room, and put →
I am here pretty shameless in promoting cool devices from people I somehow know. Here is one to all to the list of those Tagsu – The Digital Wondertag. Tagsu is a wearable, programmable wondertag – that according to the inventors you should absolutely never, ever be without! Here is promotional video from Tagsu channel: →
How to build a IoT device? Cloudwash – Creating the Technical Prototype is an interesting project description how to design and build a connected washing machine. Cloudwash developers understood that to understand and design for this type of device, the designers need to have a working technical prototype that allows experimenting and getting experience. So →