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Chemical Online Quiz Tests for Freshers. Engineering interview questions,multiple choice questions,objective type questions,seminor topics,lab viva questions and answers ,online quiz test pdf free download for freshers. Please forward this error screen to 216. This type of oscillator is simple in design, compact in size, and remarkably stable in its frequency output. However, the maximum frequency output of a typical Wien bridge oscillator is only about 1 MHz. This is also, in fact, a phase-shift oscillator.
Wein Bridge Oscillator Circuit The circuit diagram of Wien bridge oscillator is shown in the figure below. It is essentially a two-stage amplifier with an R-C bridge circuit. The phase’-shift across the network lags with increasing frequency and leads with decreasing frequency. By adding Wien-bridge feedback network, the oscillator becomes sensitive to a signal of only one particular frequency.
Q1 will amplify signals over a wide range of frequencies and thus direct coupling would result in poor frequency stability. Wien-bridge feedback network frequency stability is increased. In the bridge circuit R1 in series with C1, R3, R4 and R2 in parallel with C2 form the four arms. This bridge circuit can be used as feedback network for an oscillator, provided that the phase shift through the amplifier is zero. This requisite condition is achieved by using a two stage amplifier, as illustrated in the figure.