All about electronics and circuit design

Electromechanical thermostat

Here is teardown of Stego FZK 011 thermostat. Thar is an electronechanical thermostat that can control heating resistor and/or cooling fan. The thermostat is based on bimetal strip that bends based on temperature. To get sharp transition and some hysteresis there is also magnet near silver calibration adjustment screw and electrical contacts. Components on board

Android 12

Android 12 is the newest Android mobile operating system version. Android 12 is the twelfth major release and 19th version of Android, the mobile operating system developed by the Open Handset Alliance led by Google. Android 12 was released publicly on October 4, 2021, through Android Open Source Project (AOSP) and was released to supported

Ethernet measurements

Ethernet over twisted-pair technologies use twisted-pair cables for the physical layer of an Ethernet computer network. Most commonly standards use 8P8C modular connectors (often called RJ-45), and supported cable standards range from Category 3 to Category 8. These cables typically have four pairs of wires for each connection, slower standards (10M and 100M) used only

Car heating on freezing winter

When weather gets freezing cold car windows start to freeze and engine can have problem to start. For this reason in countries where there is freezing cold weather on winter time, people use heaters to help up starting their cars during winter time. In Finland it is common to use engine preheater and interior heater.

10 Million Arduino UNOs

Arduino Celebrates 10 Million UNOs, Launches the Tiny Collectable Arduino UNO Mini Limited Edition https://www.hackster.io/news/arduino-celebrates-10-million-unos-launches-the-tiny-collectable-arduino-uno-mini-limited-edition-12793b2461f9 “The iconic board, which first launched back in 2010, has become synonymous with Arduino itself,” Major sales milestone gives birth to a compact UNO clone, finished in eye-catching black and gold — and even boasting castellated pins. The first tweak

Max Headroom signal hijacking

Happy Max Headroom signal hijacking day!! https://en.m.wikipedia.org/wiki/Max_Headroom_signal_hijacking The Max Headroom signal hijacking occurred on the night of November 22, 1987, when the television broadcasts of two stations in Chicago, Illinois, United States, were hijacked in an act of broadcast piracy by a video of an unidentified person wearing a Max Headroom mask and costume. According

Dynamic random flip memory

Row hammer (also written as rowhammer) is a security exploit that takes advantage of an unintended and undesirable side effect in dynamic random-access memory (DRAM) in which memory cells interact electrically between themselves by leaking their charges, possibly changing the contents of nearby memory rows that were not addressed in the original memory access. The

Ancient “fake RJ-45″

Who invented that and decided that it was a good idea to start to use this 10 pin RJ-45 look-alike connector? I wanted to do measurement with multimeter on UTP wiring, took a cable (left) that looked like RJ-45, but nothing worked as planned with it. Ended up butchering a real CAT6 cable (on right)

European mains power

This post is about European mains power. Electricity in EU countries conforms to the European standard, coming out of the wall socket at 230 volts alternating at 50 cycles per second. While the voltage and frequency are fixed, the mains connectors and wiring practices can vary between different countries in Europe. One thing to note