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  1. Help needed to generating multiple PWM

    Hi there,
    Recently I buy an oscilloscope. :D Then I measure an inverter circuit PWM [PIC16F73 MCU, 3 PWM output including CCP1]. I took some read from PWM outputs of MCU..

    Here is some of them:
    Click image for larger version. 

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    I exactly don't know how Inverter PWM works, I am a student of 1st semester of BSc in CSE. But I am trying to build ...
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  2. Top 10 Electronics Inventions

    By Chris Francis
    (originally appeared on EEWorldonline)

    I don't mean the transistor radio or mobile phone, but electronic devices and circuits that have been significant and enduring. Some are not necessarily "inventions", depending on how you define an invention, but significant designs, devices or techniques. It will depend on your area of interest (and age). You might think the GaAsFET was the most significant invention (or creation), or the thermionic triode. ...
  3. Changing the Focus

    Those of us who have been in the PCB design business for more than a decade either have direct knowledge of, or have heard the stories about, how the profession has evolved since the late 70’s and early 80’s. The shift from drafting tables, Mylar, and hand taping, to light tables, digitizers and CRT’s, to autorouters and then auto-interactive routing, have all been part of the changing landscape. The large minimally lit “fishbowls” with raised floors have been replaced with individual cubicles, ...
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  4. Dimming LEDs

    By Bill Schweber

    As the use of LEDs for area lighting has grown dramatically, with both the use of LED-based replacement bulbs as well as LED-based fixtures for new construction (called luminaires in the trade), the issue of dimming these LEDs becomes more critical. LEDs require a very different technique for dimming than the conventional legacy incandescent bulb. The dimming technique differs greatly if the LED is being used in a retrofit installation that already has an incandescent ...
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  5. How to power and configure LEDs

    By Bill Schweber

    LEDs – light-emitting diodes – have largely supplanted other sources of light in many applications. They are used in applications ranging from small on/off power indicators, to small and large alphanumeric displays, to screen backlighting, and even for area and street illumination.

    It’s well known that LEDs are far more efficient than venerable incandescent lighting, and somewhat more efficient than fluorescent-based sources. While there are still specialty ...
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