An electrical outlet tester, receptacle tester or socket tester is a device used to verify that an electrical wall outlet is connected correctly. It confirms continuity and polarity of the electrical connections. The outlet tester is designed to check that each contact in the outlet is connected to the proper wire in the building’s wiring. →
A useless machine is a device which has a function but no direct purpose. Typically it is an amusing engineering “hack“, or as an intellectual joke. The most well-known “useless machines” are those inspired by Marvin Minsky‘s design, in which the device’s sole function is to switch itself off by operating its own “off” switch. →
I had a small box full of USB cables that I did not know if they were good or not after use. Those were taken out of use when they did not seem to work OK, and nothing is more annoying than unreliable USB charging cable. I found this 3-In-1 Micro USB Type-C Data Mini →
I have wanted to have an easy to use meter for measuring small SMD component. I first tried to fill my need with CEM SMD-100 Smart Electronic Components Tester few months ago, but that CEM SMD-100 meter did not work for me because it was very unreliable. To fill the need, I decided to test →
A decade box is a type of test equipment that can be used to substitute the interchanging of different values of certain passive components when you need adjustable value in electronics laboratory. Decade boxes are made for resistance, capacitance, and inductance. Decade boxes are typically quite expensive devices (compared to other cheap electronics parts). I →
Sometimes you wish you had a very small basic oscilloscope that would be easy to carry around as tool for those situations where you need to more measuring that can be done with your multi-meter. One day I found an oscilloscope kit DSO150 while browsing the banggood.com site. This model was originally only available as →
Many electronics devices have many screws in then. So opening them and closing (for repair or tear-down purposes) with normal screwdriver can feels sometimes as work. For bigger devices I use a small RYOBI cordless screwdriver with adjustable torque setting. It is suitable for medium size screws found in many electrical devices. But for those →
I wrote around two years ago a blog posting on RJ-45 Ethernet surge protection. Now it is time to check out what is inside one cheap Ethernet surge protector. The product here is very cheap (around $2) CY UT-013 Lightning Protection RJ45 UTP STP CAT6 CAT5e Female to Female Network Lan Adapter Extender. The specifications →
Here is tear-down of cheap USB 2.0 to CAT5E CAT6E RJ45 LAN Modem Extension Extender Adaptor for Webcam XBOX adapter. This adaptor is designed to allow your USB cameras, printers, webcams, keyboard, or any other USB device to be situated some longer than normal USB cable (few meters) distance away from PC. This converts USB →
This is a quick lab review to cheap (2 Euros) DC motor speed control module DC 3V To DC 35V 5A 90W Mini DC Motor PWM Speed Controller Module Speed Regulator Adjustable Light Modulator Electronic Switch Module Board. This module is advertised as a wide voltage DC motor governor for DC3-35V (3-9V input needs to →