Month: November 2015

In this video Ms. Shristy Khandelwal, asst. professor, B. Tech Dpartment, Electronics and Communication, Biyani Girls College, Jaipur explains about the PLL which is a control system that generates a signal that has a fixed relation to the phase of a reference signal. In other words, PLL is a circuit which generates a frequency and then detects phase difference between input and output frequency according to which it corrects the output frequency, so as to lock or synchronize the frequency of a controlled oscillator. PLL consists of three blocks i.e phase detector, low pass filter, and voltage controlled oscillator.
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In this video Ms. Shristy Khandelwal, asst. professor, Biyani Girls College, explains the purpose of power amplifier which takes a signal from a source device and makes it suitable for driving a loud speaker. Audio power amplifiers are those amplifiers which are designed to drive loud speakers .Power is not really something that can be “amplified”. Voltage and current can be amplified.
http://www.gurukpo.com/