Resistor reading apps

If you are a long time hacker, you might remember all resistor color codes so well that you have no problem in reading them without thinking to much. For other there are those resistor color code tables and calculators. But could this task be automated? Maybe with mobile phone? Reading Resistors With OpenCV posting mentions

Why Digital Oscilloscopes Appear Noisy

Why do digital oscilloscopes appear noisier than traditional analog oscilloscopes? In EEVblog #601 – Why Digital Oscilloscopes Appear Noisy posting Dave busts the myth that digital scopes are noiser than analog scopes, and demonstrates what inherent advantages digital scopes can have over analog scopes in terms of true waveform capture. And how long exposure camera shots

RF Calculators & Conversions

Do you need to do RF Calculators & Conversions? Pasternack just published new RF calculators and conversion on-line tools to Pasternack’s RF/Microwave calculators and conversions section provides easy-to-use tools ranging from complex mathematical formulas to simple conversions. Besides just making the calculations those tools also show the equations used to make the calculations (so

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