Superheterodyne receivers have been developed to overcome the shortcomings of straight radio receivers. All modern radio receivers operate on superheterodyne […]

Communication by means of sound waves is possible over short distances. If the sound waves are converted into electrical signals,

When the peak amplitude of a sinusoidal carrier is changed in proportion to instantaneous amplitude of the modulating signal, amplitude

Figure 1: RC Integrator Circuit. The RC integrator circuit contains a capacitor C and a resistor R, and their positions

Figure 1: RC Differentiator Circuit. A simple RC differentiator circuit consists of a series combination of a capacitor C and

The transistor when used as a switch must, therefore, be able to operate in cutoff region (open switch) and saturation

Fig. 1. RC coupling. RC Coupling is the simplest and cheapest type of coupling scheme as shown in Fig. 1

Fig. 1. Transformer coupling. A transformer may also be used for coupling the output of an amplifier to the load