EasyElectronics

  Introduction of Oscillators and Barkhausen Criterion Introduction ■        A Circuit which can deliver electrical energy of some specific frequency is called oscillator. ■        The waveforms produced may be sinusoidal or non-sinusoidal. ■        An oscillator receives D.C. energy and changes it into A.C. energy of desired frequency. ■        The frequency of oscillator depends on components of the oscillator. ■        There is no need of external input signal in oscillators, it produces output signal by its own. ■        This output can be used as energy source for other electrical circuits. ■        An amplifier has negative feedback, where as an oscillator has negative as well as positive feedback. ■        Concept of Feedba...

               Solar Cell              A Solar cell is a semiconductor device that converts the energy of light directly into electrical energy.              This conversion of light energy into electricity is known as photovoltaic effect.              It is a form of photoelectric cell when exposed to light, can generate and support an electric current without supply of any external voltage source.              Working and Symbol of Solar Cell                               Solar Cell working principle Solar Cell working principle: ...