I decided to replace my aging Zyxel and Netwjork 100 Mbit/s Ethernet switched with new gigabit models. I decided to get two ZyXEL GS-108S v2 Media Switch as replacement for those. The Zyxel GS-108S v2 10/100/1000 Mbps switch is designed to provide reliable high-performance media network connectivity – that’s what I need. The Zyxel GS-108S →
Have you ever wondered about how safe your place or position is regarding electromagnetic and magnetic fields? Then here is your chance to find out. Everyone is exposed to a complex mix of weak electric and magnetic fields, both at home and at work, from the generation and transmission of electricity, domestic appliances and industrial →
A good electronics laboratory needs references.A good home laboratory needs cheap but “good enough” references. I needed a voltage reference, and found out cheap kit: 3pcs AD584 4 Channel 2.5V / 5V / 7.5V / 10V High Precision Voltage Reference Module costs less than 10 Euros. This device is AD584 based 2.5V / 5V / →
I got a comment that recommended this RF BRIDGE 0.1 – 3000 MHz from http://www.transverters-store.com/rf_bridge/rf_bridge.html. It looked really interesting as I was planning to build something similar myself. The price was very reasonable ($10) so I had to test out it. Did the ordering, and quite quickly I received a letter from Ukraine that contained →
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 →
I have made many experiments with my DVB-T SDR stick. It can handle frequency range from around 30 MHz up to more than 1 GHz. There are cases, where there is need to receive lower frequencies. To make receiving those low frequencies with such cheap RTL-SDR receiving sticks, there are two approaches: using upconverter or →
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 →
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 →
Arduno neeeds sensors. Geekcreit® 37 In 1 Sensor Module Board Set Kit For Arduino Plastic Bag Package promises to give many sensors cheaply. That kit says that t contains 37 sensors. Actually it has 37 items, but not all of them are sensors (there are buzzer, relay, LED etc.). It is cheapest kit on the →
Tesla coils and other high voltage equipment that make sparks are always entertaining and potentially dangerous. There are some portable tesla coils you can buy online that say, “safe, low current”, and yet they still produce lightning and have a high voltage output.700K Mini Coil Tube Neon Glow Coil With Transparent Plate Power Supply For →