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31 Mar 2014


The accelerometer can measure acceleration in two axis using Analog Devices ADXL202. +-2g can be measured in each axis.

The accelerometer can measure acceleration and time. Using the time and the acceleration it can calculate and display:Time (s)

  • Average acceleration (m/s2)
  • Instantanous acceleration (min/max) (m/s2)
  • Speed (m/s & km/h)
  • Distance (m & km)

The mass of the object can also be input, the accelerometer can then also display:Instantenous Force (N)

  • Average Force (N)
  • Instantenous Power (kW and HP) * .

Bullit Accelerometer – Accelerometer with microcontroller and display - [Link]


31 Mar 2014


This project was originally released on www.robives.com

Resistors use coloured bands to show their value. There are usually four bands, the first two code for the first two digits of the resistors value, the third is the multiplier, basically the number of zeroes on the end of the number. The final band shows the tolerance of the resistor, how accurate it is.

This color wheel helps you decode the bands on standard resistor so you can see what value they are .

Resistor Color Wheel - [Link]

30 Mar 2014

This video discusses how to measure the ESR (equivalent series resistance) of a capacitor using an oscilloscope and function generator. All of the capacitors tested in this video were 220uF electrolytic caps. In reality, the resistance in the plates of a dried out electrolytic capacitor can’t be modeled as a simple series resistor, but for the purposes of identifying good from bad, this simplification works fine.

Measure Capacitor ESR with an Oscilloscope and Function Generator - [Link]

30 Mar 2014

Dave takes a look at the world’s cheapest temperature controlled soldering station, the $16 Hakko 936 knockoff Yihua 936 from Hobby King. How does it compare to the older genuine Hakko 926? Also, thermal capacity comparison testing is done on those two irons plus the high thermal capacity JBC. Sagan also gives his verdict.

EEVblog #596 – World’s Cheapest Soldering Station – Yihua 936 - [Link]

30 Mar 2014


ZXLee built a simple sensor for Arduino which allows him to detect colors. The idea lies behind using red, green, blue LEDs and Light Dependent Resistor (LDR). Lee Zhi Xian writes:

Previously I have made a colour sensor using Arduino but don’t have the time to update it on my blog. Today I am going to share the details of this mini project. Basically, the sensor consists of three LEDs and Light Dependent Resistor (LDR). The LDR will detect the colour and display it to another RGB LED. Besides display it on the RGB LED, the colour will also display on PC. RGB LED is commonly used in display colours on LCD or OLED such as the monitor and television.


Simple technique of sensing colors using Arduino - [Link]

29 Mar 2014


Connectors of the PV, SV and SH series are available in a huge amount of versions and sizes, that´s why you´ll certainly find here a suitable type for you.

A very frequent requirement for a simple and reliable connection of wires to a PCB is actual about as long as the world knows plated copper boards. There are many solutions and producers, thus a choice of suitable type is usually a question of your preferences, requirements of a device, availability, offer of distributors,….

Even in our store can be found various solutions from world-class producers like TE Connectivity (Tyco, AMP), Wago, Phoenix Contact and also from company Euroclamp. Just the last one mentioned – Euroclamp, focuses mainly on PCB terminals, what is reflected in a wide offer. From our experience we can confirm a quality and reliability of these connectors. To the most favorite ones belong series PV, SV and SH, what are plug-in connectors (terminal blocks) for PCB and the mating types for a cable. They´re available in pitches of 2.5mm/ 2.54mm/ 3.5mm/ 3.81mm/ 5.0 mm/ 5.08mm/ 7.5mm/ 7.62mm/ 10.0mm/ 10.16 mm. So as to make you a selection of a right type easier, we bring you a few hints and explanations regarding their description.

PVxx – main type for a PCB (connector with pins).
Example: PV02 (02-24= number of poles) – 5.08 (pitch of pins) – V (V-vertical, H-horizontal)- M (M-modular, P-closed)

SVxx – connectors (female) for a cable – intended for connection with the PVxx series
SV02 (02-24= number of poles) – 5.08 (pitch) – P (P – rear wire connection, F- frontal wire connection) – * (additional code, for example „K“= version with side screws)

SHxx – right angle cable connectors (female) – intended for connection with the PVxx series)

A very useful “complement” of these series is also the SFxx , series, i.e. – a terminal block enabling a “wire to wire” connection (with types SVxx or SHxx). It can be very convenient if we for example want to jump some module and to maintain input and output leads interconnected (enable to make for example various versione of the same product. A novelty in the Euroclamp portfolio is also the PF series – for a PCB (female connector), enabling connection with PF – (male connectors).
A common feature of all PVxx connectors is a relatively high current handling ability – for example 12 (16)A/450VAC at types with 5.0 or 5.08mm pitch and a maximum wire cross section of 4/2.5 mm2 (solid / stranded wire). Body of connectors is made of a rigid self-extinguishing polyamide (UL94-V0) and the connector itself is made of nickel plated copper alloy. Basic color of these connectors is green (RAL6032) but upon order they´re also available in other colors (grey, black, blue, red, yellos, brown and other). A considerable advantage is also a wide range of operating temperatures of -40 to +130°C.

Types with a wide pitch (for example 10mm) are physically the same with types with a half pitch ( 5mm), they only differ in omitted pins and naturally the maximum allowed voltage is higher (750VAC). Perhaps the best idea about possibilities of these „plug-in“ connectors will give you attached pictures. Detailed description can be found in the Euroclamp short-form catalogue, in the main catalogue Euroclamp, as well as in datasheets at particular types.

Do you already have solved a connection to a PCB? - [Link]

28 Mar 2014


This 1w audio amplifier circuit is designed using NCP2830 audio IC manufactured by ON Semiconductor. This audio power amplifier ic designed for portable communication device applications and require few external electronic components. NCP2830 is capable to provide 1W continuous output power in 8 ohms load. NCP2830 audio power amplifier main features are : high quality audio (THD+N = 0.04%) , low noise: SNR up to 100 dB, overall system efficiency optimization: up to 89% , Superior PSRR (−88 dB): Direct Connection to Battery , Very Low Quiescent Current 7 mA , Optimized PWM Output Stage: Filterless Capability , Selectable gain of 2 V/V or 4 V/V .

1W audio amplifier circuit using NCP2830 - [Link]

28 Mar 2014


The organic solar film producer Heliatek based in Dresden, Germany have announced an improved type of solar cell which gives a transparency of 40 % while achieving 7 % energy conversion efficiency. Although its efficiency is not as good as the company’s opaque organic cells (roughly 12 %) this new solar film can be discreetly integrated into building and vehicular glazing to provide an energy harvesting tinted transparent film. The film is also effective at low light levels and high temperatures where conventional cells lose out.

HeliaFilm uses small molecules (oligomers), developed and synthesized at Heliatek. Oligomers are deposited at low temperatures in a roll-to-roll vacuum process and by changing the spectral absorption properties of the molecules the film can provide different levels of transparency and a colored tint. According to Thibaud Le Séguillon, Heliatek CEO “The transparency of our products is at the core of our market approach. Our HeliaFilm™ is customized to meet our partners’ specific needs, we are a component supplier and this component is a film which can combine transparency and energy generation. This unique combination widens our market potential.”

Organic Solar Film adds Tint and Power - [Link]

28 Mar 2014


Our beloved silicon-based transistors can “only” work at temperatures up to 550° F (around 290° C), which is much more than what’s needed for most general-purpose applications. But those don’t include a nuclear reactor, obviously! (Unless you have one at home. Do you?)

University of Utah engineers have developed tiny plasma-based transistors that can withstand temperatures up to 1,450° F (almost 800° C) and work with ionizing radiation. Since plasma itself is ionized gas, it can even be said that nuclear radiation contributes to proper functioning of these devices. Besides, current plasma-based transistors are about 500-µm long, while these newcomers measure 1–6 µm (!).


[via Elektor Electronics]

March 20, 2014 – University of Utah electrical engineers fabricated the smallest plasma transistors that can withstand high temperatures and ionizing radiation found in a nuclear reactor. Such transistors someday might enable smartphones that take and collect medical X-rays on a battlefield, and devices to measure air quality in real time.

“These plasma-based electronics can be used to control and guide robots to conduct tasks inside the nuclear reactor,” says Massood Tabib-Azar, a professor of electrical and computer engineering. “Microplasma transistors in a circuit can also control nuclear reactors if something goes wrong, and also could work in the event of nuclear attack.”

Tiny Transistors for Extreme Environs - [Link]

27 Mar 2014


Researchers from North Carolina State University have developed a new processing technique that makes light emitting diodes (LEDs) brighter and more resilient by coating the semiconductor material gallium nitride (GaN) with a layer of phosphorus-derived acid.

“By coating polar GaN with a self-assembling layer of phosphonic groups, we were able to increase luminescence without increasing energy input,” says Stewart Wilkins, a Ph.D. student at NC State and lead author of a paper describing the work. “The phosphonic groups also improve stability, making the GaN less likely to degrade in solution.”

New technique makes LEDs brighter, more resilient - [Link]






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