Product tests

HoldPeak HP-990A SMD component tester

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

Step adjustable resistor box

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

Mini Electric Screwdriver

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

USB to RJ45 adapter teardown

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

Cheap DC motor speed control

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

Stepper motor driver TB6600

For controlling stepper motors you need a suitable controller. It is possible to build controller using discrete components, controller ICs and using micro-controller. It can be fun to build our own stepper controller, but when you have done that few times, you might want to start looking or reasonably priced ready made easy to use

Bad CEM SMD-100

I got a CEM SMD-100 Smart Electronic Components Tester because it was on sale at very low price. It turned out to be a bad investment. The component tweezers part make very intermittent contact with the meter, so measuring the components was very unreliable. The meter seemed to work OK with the measurement supplied leads