Bad idea: GPS tracking of cars

Recently, the media has been on discussion on making the country roads to be controlled by private company and Finnish cars envisaged the so-called mandatory. black box. On this discussion it has been several times mentioned that the Finnish Government has planned a mandatory monitoring devices for all cars to collect “road tax” based on

Bizarre car to “mains” adaptor

Some time ago I built Avalanche pulse generator circuit. In that project I used a slightly odd car to “mains” adaptor device as the DC/DC converter to generate the voltage (around 100V) needed to power the avalanche circuit. Here is view of that part of Avalanche pulse generator circuit: I had bought that device that

Trust UPS teardown

An uninterruptible power supply (UPS) is an electrical apparatus that provides emergency power to a load when the input power source or mains power fails. The on-battery runtime of most uninterruptible power sources is relatively short (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment.

Huge video display technologies

Big wall size video displays has been available from quite bit of time. Very many modern big displays are built using LED technologies that I covered yesterday in Big LED video display technology posting. This article covers some of the older technologies how big wall size video displays have been built. Before huge video displays

Cell phone charger

I have used some for time Barkan PB22B 2200mah Portable Charger Black to charge my smart Samsung S4 mini phone. I had some issues first that the charging was not reliable with my phone (worked well with some other devices). I decided to look what was wrong with USB Power Current Voltage Tester, and with

Cheap USB charger teardown

Here is teardown of another cheap USB charger bought some time ago for around two euros from some chinese online shop. Brand “Designed by Able” Model 1300. Label Circuit board Closeup of circuit board One finding is that rectifier is replaced with diode, meaning that this half-wave rectifies mains power. Other findings: – The switcher

Sonoff IoT swich

DIY Wi-Fi Wireless Switch For Smart Home With ABS Shell Socket Remote Control Switch Module is an IoT home automation device. This device, also known as Sonoff from ITEAD, can control 110V to 230V AC mains power on/off (up to 7A or 10A depending on document). The switch is controlled with mobile app (or local