Description. Circuit shown here can be used to jam FM radios in its vicinity. The circuit is nothing but a classic single transistor oscillator operating in the VHF region. Working principle of the circuit is very simple and straight forward. Powerful VHF oscillations from the circuit will interfere with the FM signals to nullify it. […]
Sweep-Frequency Generator The working of a sweep-frequency generator is explained in the article below. The working and block diagram of an electronically tuned sweep frequency generator and its different parameters are also explained. Related Article SIGNAL GENERATORS A sweep frequency generator is a type of signal generator that is used to generate a sinusoidal output.
Signal Generators In this article, the detailed explanation of a signal generator is given. The principles of signal modulation, the block diagram of an AM signal generator and the measures needed to achieve a stable frequency output is explained below. RELATED ARTICLE SWEEP FREQUENCY GENERATOR Like an oscillator, a signal generator is also a source
RELATED ARTICLE VOLTAGE CONTROLLED OSCILLATOR (VCO) SWEEP-FREQUENCY GENERATOR BEAT FREQUENCY OSCILLATOR (BFO) WIEN BRIDGE OSCILLATOR PHASE SHIFT OSCILLATOR Here are the parameters that are to be noted while selecting an oscillator for a particular application. Frequency Range. The oscillator selected for a particular application should be caÂpable of supplying an output signal whose upper and
In this article, the working of a negative resistance oscillator is explained along with its types-dynatron and tunnel diode oscillator. The tunnel diode oscillator characteristics and circuit is also explained in detail. Related Articles VOLTAGE CONTROLLED OSCILLATOR (VCO) SWEEP-FREQUENCY GENERATOR BEAT FREQUENCY OSCILLATOR (BFO) WIEN BRIDGE OSCILLATOR PHASE SHIFT OSCILLATOR TRANSISTOR PHASE SHIFT OSCILLATOR Negative
Beat Frequency Oscillator (BFO) Related Articles OSCILLATOR OPERATION TUNED BASE OSCILLATOR PHASE SHIFT OSCILLATOR COLPITTS OSCILLATOR Use the link OSCILLATORS to see all the articles including the working of oscillators, frequency stability, types and so on. The beat frequency oscillator (BFO) is used to produce a variÂable frequency output in the audio-frequency (AF) range. BFO
Wein Bridge Oscillator is one of the mosttypesular type of oscillators used in audio and sub-audio frequency ranges (20 – 20 kHz). This type of oscillator is simple in design, compact in size, and remarkably stable in its frequency output. Furthermore, its output is relatively free from distortion and its freÂquency can be varied easily.
RC Phase shift oscillator. RC phase shift oscillator or simply RC oscillator is a type of oscillator where a simple RC network (resistor-capacitor) network is used for giving the required phase shift to the feedback signal. In LC oscillators like Hartley oscillator and Colpitts oscillator an LC network (inductor- capacitor network) is used for providing
What is a FET Phase Shift Oscillator? A phase shift oscillator is a circuit that produces sign waves. The output is fed back to the input which changes the ‘phase’ of the waves. The phase shift increases with frequency and can reach a maximum of 180 degrees. Phase shift oscillators have a wide range of
An introduction to Audio Oscillators also known as RC Oscillators So far, we have considered the oscillators which use L-C tuned circuit that causes a phase shift of 180° due to inductive or capacitive coupling in addition to a 180° phase shift produced by the transistor itself. The oscillators employing L-C elements, called the L-C
In crystal oscillators, the usual electrical resonant circuit is replaced by a mechanically viÂbrating crystal. The crystal (usually quartz) has a high degree of stability in holding conÂstant at whatever frequency the crystal is originally cut to operate. The crystal oscillators are, therefore, used whenever great stability is needed, for example, in communication transÂmitters, and
Hartley oscillator circuit. Hartley oscillator was invented in 1915 by the american engineer Ralph Hartley while he was working for the Western Electric company. The original design was tube based and he got a patent for it in the year 1920. In a Hartley oscillator  the oscillation frequency is determined by a tank circuit comprising
The Clapp oscillator shown in figure. is a refinement of the Colpitt’s oscillator. The single inductor found in the Colpitt’s oscillator is replaced by a series L-C combination. Addition of capacitor Ca in series with L improves the frequency stability and eliminates the effect of transistor parameters on the operation of the circuit. The
Colpitts Oscillator An oscillator is used to produce electronic signal with oscillating periods. Eg: Sine wave, square wave etc.. Oscillators are broadly classified into two – linear oscillators and non-linear oscillators. As the name implies, linear oscillators are used to produce linear or sinusiodal waveforms. Whereas, non-linear oscillators are used to produce non-linear (non-sinusoidal output
Tuned base oscillator. Tune base oscillator is another type of transistor based LC oscillator where the tuned circuit (tank circuit) Â is placed between the base and ground of the transistor. The tuned base oscillator is also called “Armstrong oscillator” after the name of its inventor. The tuned circuit essentially consists of a transformer and capacitor
Tuned collector oscillator. Tuned collector oscillation is a type of transistor LC oscillator where the tuned circuit (tank) consists of a  transformer and a capacitor is connected in the collector circuit of the transistor. Tuned collector oscillator is of course the simplest and the basic type of LC oscillators. The tuned circuit connected at the
LC oscillators. LC oscillator is a type of oscillator where a LC (inductor-capacitor) tank circuit is used for giving the required positive feedback for sustaining the oscillations. The LC tank circuit is also termed as LC resonant circuit or LC tuned circuit. According to the Barkhausen criterion for sustained oscillations, a circuit will sustain stable
Essentials of Transistor Oscillators An oscillator must have the following three elements Oscillatory circuit or element. Amplifier. Feedback network. The oscillatory circuit or element, also called the tank circuit, consists of an inductive coil of inductance L connected in parallel with a capacitor of capacitance C. The frequency of oscillation in the circuit depends upon
How an oscillator operates ? Related Articles BASIC OSCILLATORY CIRCUITS TRANSISTOR PHASE SHIFT OSCILLATOR NEGATIVE RESISTANCE OSCILLATORS HARTLEY OSCILLATOR To know the basics of oscillators, its frequency stability, types of oscillations, different types of oscillators and so on, use the tag link – OSCILLATORS A feedback amplifier having closed-loop gain, Af greater than unity can
Related Posts OSCILLATOR OPERATION BASIC OSCILLATORY CIRCUITS CLAPP OSCILLATOR WIEN BRIDGE BRIDGE OSCILLATOR LC OSCILLATORS AND TYPES Even if an oscillator is set at an initial frequency, it cannot be maintained throughout. They keep on changing either in a uniform way or sometimes erratically. the term “frequency stability” is used to define the ability of
Related Posts DAMPED AND UNDAMPED OSCILLATIONS OSCILLATOR OPERATION TUNED BASE OSCILLATOR COLPITT’S OSCILLATOR CRYSTAL OSCILLATOR Basic Oscillator Circuit The oscillatory circuit, also called the L-C circuit or tank circuit, consists of an inductive coil of inductance L connected in parallel with a capacitor of capacitance C. The values of L and C determines the frequency
This article has two sections: One discusses criteria for selecting an oscillator while other one discusses various types of oscillations. 1. Selection of an Oscillator 2. Types of Oscillations Criteria for Selection of an Oscillator Here are the parameters that are to be noted while selecting an oscillator for a particular application. Frequency Range. The
Introduction to Oscillators An oscillator is the basic element of all ac signal sources. It generates a sinusoidal signal of known frequency and amplitude. An oscillator is one of the most basic and useful instruments used in electrical and electronic measurements. Since sinusoidal waveforms are encountered so frequently in electronic measurement work, the oscillator (sine
Description. A simple sawtooth wave generator circuit for generating a saw tooth wave form using a NE555 IC is given below. The frequency of the wave form can be varied by using a POT. The capacitor C, resistor R and zener diode forms a constant current source for charging of the capacitor. When the voltage
Description. Here is a simple variable frequency circuit based on timer NE555. Here NE55 is wired as an astable multivibrator, whose output frequency can be varied by varying a potentiometer. This circuit is a must in the work bench of a electronic hobbyist. Frequencies ranging from several Hz to several KHz can be obtained using
