Sound level measuring with Android phone

Sound pressure level (SPL) or sound level is a logarithmic measure of the effective sound pressure of a sound relative to a reference value. It is measured in decibels (dB) above a standard reference level (20 µPa, which is usually considered the threshold of human hearing at 1 kHz). I have earlier used several different decibel

DIY Electronics Tester Kit M168

I saw an interesting kit at and decided to try it: DIY Meter Tester Kit For Capacitance ESR Inductance Resistor NPN PNP Mosfet M168 . The reasons for interests are good specifications, based on open source hardware design and price is reasonable ($12.22 / 9.37 Euro). DIY Meter Tester Kit For Capacitance ESR Inductance

USB charger meter with protection

Have you ever wondered how stable voltage your USB power source gives and how much current does your device take (your mobile phone charging or own circuit? 0.28″ LED 3-Digit Red Display USB Power Charger Data Transmit Current Voltage Tester (3~10V/0~3A) is a product that can do that. It shows the charging voltage and current

Android engineering apps

CFE Media’s Apps for Engineers is an an interactive directory of almost 60 engineering-related Android applications that were created by various companies. The idea is to offer a “pre-sort” of relevant mobile engineering applications loaded with various calculators, catalogs, file viewers, measurement tools, and more. Apps for Engineers is targeted for engineers working in industrial,

Interesting Analog Design Kits

I have read more than year ago (2012) interesting articles about Digilent‘s Analog Discovery Kit. I even quickly tried the WaveForms Software the cames with it (freely available and testable without hardware). It looked interesting, but I decided that maybe I don’t at the moment need this and skipped it (I did not even write

DIY Wearable Soldering Iron

I have last year written about USB soldering irons starting with USB soldering iron posting that introduced the idea. I followed with DIY USB soldering iron posting that gave ideas how to make your own instead of buying a ready made product. Now it is time for an updateon this topic. Element 14  Ben Heck

HT-USBee AxPro review

I found a cheap mixed signal oscilloscope product: HT-USBee AxPro. This HT-USBee AxPro is a said to be 8 Channel Logic Analyzer Oscilloscope Compatible USBee AX Pro I2C IIC SPI CAN Debugger. It features Oscilloscope Input (single channel, 16Msps, 3MHz bandwidth) and 8-CH Logic Analyzer. With suitable software it can be used as Data Recorder,