Questions & Answers of Oscillators and Feedback Amplifiers

In the Wien Bridge oscillator circuit shown in figure, the bridge is balanced when

An oscillator circuit using ideal op-amp and diodes is shown in the figure.

The time duration for +ve part of the cycle is Δt1 and for –ve part is Δt2. The value of Δt1-Δt2RC will be _____________.

In the feedback network shown below, if the feedback factor k is increased, then the

A 3-line to 8-line decoder, with active low outputs, is used to implement a 3-variable Boolean function as shown in the figure

The simplified form of Boolean function F(A,B,C) implemented in ‘Product of Sum’ form will be

The truth table of monoshot shown in the figure is given in the table below :

Two monoshots, one positive edge triggered and other negative edge triggered, are connected as shown in the figure, The pulse widths of the two monoshot outputs Q1 and Q2 are TON1 and TON2 respectively.

The frequency and the duty cycle of the signal at Q1 will respectively be