Figure 1: Positive Feedback Amplifier.
When the feedback signal (Xf) is in phase with the source signal (Xs), then such type of feedback is referred to as positive feedback or regenerative feedback amplifier. A feedback amplifier circuit is illustrated in figure 1. Continue reading What is Positive Feedback Amplifier? Block Diagram, Gain Formula & Advantages
(a) Circuit Diagram
(b) Phasor Diagram
Figure 1: Parallel Resonance Circuit.
In a parallel resonant circuit, the inductor L and capacitor C are connected in parallel as shown in Fig. 1 (a). Continue reading What is Parallel Resonance? Circuit Diagram, Phasor Diagram & Derivation
Single Tuned Amplifier circuits employ a single resonant circuit in the collector of the amplifier. The signal input is usually given to the amplifier through an input transformer but may also be fed through R-C coupling.
(a) Continue reading What is Single Tuned Amplifier? Circuit Diagram & Working
Schmitt trigger uses positive feedback in its circuit. Hence it is also called as regenerative comparator. Figure (1) shows an Op-amp Schmitt trigger.
Figure 1: Schmitt Trigger. Continue reading What is Schmitt Trigger using Op-Amp? Circuit Diagram, Derivation & Working
Zero Crossing Detector (ZCD) is a basic comparator circuit, whose reference voltage level is set at zero. It detects the zero crossing in the applied input AC signal is referred to as zero crossing detector. It is also called a sine to square wave converter.
Figure 1: Zero Crossing Detector.
Continue reading What is Zero Crossing Detector? Circuit Diagram, Derivation & Working
Figure (1): Differential Amplifier.
Differential (or Difference) amplifier or a subtractor is defined as a circuit, which amplifies the difference between two input signals. Continue reading What is Differential Amplifier using Op-Amp? Circuit Diagram, Derivation & Working
A voltage to current converter is a voltage-controlled current source. An ideal voltage controlled current source has two characteristics. Continue reading What is Voltage to Current Converter (V to I Converter) using Op-Amp? Circuit Diagram, Derivation & Working
The process of modulation in which the frequency of the carrier signal is changed according to the instantaneous magnitude of the modulating signal is known as frequency modulation.
Fig. 1: Frequency Modulation
Continue reading What is Frequency Modulation (FM)? Definition, Derivation, Waveform & Formula
A radio receiver is a device that receives the radio waves propagated by a desired radio transmitter, recovers modulating signals from these waves and gives sound output. Continue reading What is Radio Receiver? Block Diagram & Working
Superheterodyne receivers have been developed to overcome the shortcomings of straight radio receivers. All modern radio receivers operate on superheterodyne principle. Continue reading What is Superheterodyne Receiver? Block Diagram & Working