Once the undisputed leader of mobile phone technology, Nokia has found itself in retreat for the last couple of years. The key problem for Nokia lies in the lucrative ‘smartphone’ market, where much of the industry’s growth and profit is found. Newcomers Apple, with their iPhone and Google’s … [Read more...]
Three-State Vehicle Probe
April 28, 2011 by Leave a Comment
The simple probe circuit of Fig.1 was designed for use in tracing 6V or 12V vehicle wiring. Basic probes have a crocodile clip which is connected to ground (chassis) while a single bulb or l.e.d. illuminates when the probe makes a positive connection. If the indicator does not light up, then the … [Read more...]
Horn Siren with IT and OT
April 27, 2011 by Leave a Comment
Basically siren on a police patrol car and an ambulance use electronic circuit connected to the DC current. When the switch is pressed, the siren sounds immediately come out.For those of you who own a car, or any motor you can also create a similar horn. Placement was also very practical. And if you … [Read more...]
Make yourself a Low cost Ethernet cable
April 27, 2011 by Leave a Comment
It happens too often: You unbox the networking device you just bought and pull out the included Ethernet cable, only to find that it is far too short—or too long—for your needs. Most cables are at a fixed length, usually measuring no more than 4 feet. That length doesn’t present many placement … [Read more...]
Higher reliability and efficiency for ultracompact LED lamps
April 26, 2011 by Leave a Comment
The first in a new family of mains-operated LED lamp drivers from STM (STMicroelectronics) will enable designers to deliver more reliable and efficient LED retrofit lamps featuring primary-side current regulation. LED lighting, including retrofit bulbs, is expected to account for 80% of the lighting … [Read more...]
Introduction to Organic Light Emitting Diodes(OLED) – The emerging technology
April 26, 2011 by 3 Comments
As you’ve seen, LEDs are a type of diode that emits light when the device is forward biased and passing current. LEDs have been around in various forms for quite a long time and so you will already be familiar with them and how they are used. LEDs offer some notable advantages when compared with … [Read more...]
Simple Class-A Power Amplifier
April 25, 2011 by Leave a Comment
In the picture above is a series of amplifiers are used, a booster amplifier class A common emitter (CE) transistor. Working point on the class A amplifier is set at a certain point that on the load line, so the phase output current is always flowing and the point Q located on the load line … [Read more...]
Data, data, data everywhere! – total size of data in world
April 25, 2011 by Leave a Comment
Our ravenous hunger for data, and the need to store it has been measured by researchers. A study, published in the journal Science, added up all the data stored in the world by 2007 and calculated 295 exabytes – an exabyte is a billion gigabytes, or a trillion megabytes. The researchers reached … [Read more...]
Automatic Plant watering reminder
April 24, 2011 by 1 Comment
House plants in general often have a pretty hard time of it compared to their garden bound cousins, which seem to get more than their fair share of watering, even if their owner forgets, thanks to the British weather. With so many other things to think about, the first reminder that many people get … [Read more...]
Touch Light
April 24, 2011 by 1 Comment
There are many places around the house where a small light would be useful but running a mains cable to the location is impractical. Corners of dark cupboards, over the telephone to light a note pad, by the front door to help find the keyhole at night, are just some of the applications which come to … [Read more...]