Category: Oscillators and Signal Generators

Working of LC Oscillator

Engineeering Projects
working of lc oscillator

Working of LC Oscillator: The effect of charging the capacitor in Fig. 1 to some voltage potential and then closing the switch results in the waveform shown in Fig. 1. The switch closure starts a current flow as the capacitor begins to discharge through the inductor. The inductor, which resists a change in current flow, causes a gradual sinusoidal current buildup that reaches the maximum when the capacitor is fully discharged. At this point, the potential energy is zero, but since the current flow is maximum, the magnetic field energy…

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Audio Oscillators

Engineeering Projects
rc phase shift oscillator using bjt

RC oscillators are principally used for generating audio frequencies. Two popularly used RC oscillators are (i) RC phase shift oscillator using either BJT or FET and (ii) Wien Bridge oscillator. Another popularly used audio oscillator is the Beat Frequency Oscillator (BFO). We here consider these three audio oscillators. RC Phase Shift Oscillator using BJT. Figure 1 gives the basic circuit. It is a sinewave feedback oscillator and uses an amplifier followed by three section R-C phase shift network. Output of the last section is fed to the base. We assume…

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