Basic Electronics

Definition: Tuned amplifiers are used to for the amplification of a specific frequency signal or a narrowband frequency signal. Basically high frequency or radio frequency signals are amplified using tuned amplifiers. Tuning (i.e., selecting) of frequency is done by using a tuned or resonant circuit at the load. Sometimes during amplification of the signal, it is necessary to select the desired frequency range and reject others. Thus tuned amplifiers are employed in radio receivers. Need for … [Read more...] about Tuned Amplifiers

Definition: Peak detector circuits are used to determine the peak (maximum) value of an input signal. It stores the peak value of input voltages for infinite time duration until it comes to reset condition. The peak detector circuit utilizes its property of following the highest value of an input signal and storing it. Rectifier circuits usually provide an output in proportion to the average value of the input. However, some application requires measurement of the peak value of the signal. … [Read more...] about Peak Detector

Definition: Unijunction Transistor is a semiconductor switching device having 2 layers and 3 terminals and is abbreviated as UJT. It is called so because of the presence of only one junction. It has the ability to limit large power with a small input signal and is also known as a double base diode. UJT is a device that possesses negative resistance characteristic that means its emitter current rises regeneratively when triggered. Thus an emitter supply is needed in order to restrict it. In … [Read more...] about Unijunction Transistor (UJT)

As we are aware of the fact that a time base generator does not provide accurate linearity in sweep voltages. Thus various methods of Sweep Voltage Generation are used in order to have a linear output. The methods are discussed below: Exponential sweep circuit The circuit of a basic sawtooth voltage generator is shown below: In the circuit, the position of switch S changes from 1 to 2 thus causing the capacitor to be charged and discharged alternately. Thus an output is achieved that is … [Read more...] about Methods of Sweep Voltage Generation

Definition: The circuit that produces a linearly varying voltage or current with time is known as Time-Base Generator. It is basically a function generator that generates a sawtooth waveform of high frequency. These circuits are also known as sweep circuits. This is so because they are used to sweep the beam of electron across the screen in a horizontal direction in CRO. Types of Time-Base Generator These are basically of two types: Voltage time-base generator: It generates a voltage that … [Read more...] about Time-Base Generator

Definition: Clamper circuits are the electronic circuits that shift the dc level of the AC signal. Clampers are also known as DC voltage restorers or level shifter.  Clampers are basically classified as positive and negative that includes both biased and unbiased conditions individually. These circuits are used to clamp an input signal to a different dc level. It basically adds dc component to the applied input signal in order to push the signal to either the positive or negative side. … [Read more...] about Clamper Circuits

Definition: Clipper circuits are the circuits that clip off or removes a portion of an input signal, without causing any distortion to the remaining part of the waveform. These are also known as clippers, clipping circuits, limiters, slicers etc. Clippers are basically wave shaping circuits that control the shape of an output waveform. It consists of linear and non-linear elements but does not contain energy storing elements. The basic operation of a diode clipping circuits is such that, … [Read more...] about Clipper Circuits

Definition: Distortion in Amplifier basically implies the variation in the waveform received at the output with respect to the applied input. The unwanted alterations generated during amplification is known as distortion. A pure signal always has a single frequency component where voltage varies positive and negative by an equal amount. If this variation is less than full 360⁰ cycle, then it is said that the signal is distorted. When we talk about an ideal amplifier, the amplified output … [Read more...] about Distortion in Amplifier

Definition: Voltage regulator is a device that maintains a constant dc output voltage irrespective of the changes in input voltage or load conditions. The ac ripple voltage that is not removed by the filters is also rejected by the voltage regulators. The combinations of elements present in the design of voltage regulator ensure to have a constant output voltage with a variable input supply. Whenever there is a need to have a steady and reliable output voltage then voltage regulators are … [Read more...] about Voltage Regulator

Definition: Feedback Amplifier is a device that is based on the principle of feedback. The process by which some part or fraction of output is combined with the input is known as feedback. In simple words, we can say feedback amplifiers are the type of amplifiers in which a part of the output is given back to the input. Have a look at the pictorial representation showing how feedback is implemented. As we know that an amplifier is a device that amplifies the signal. When we talk … [Read more...] about Feedback Amplifier