The crucial difference between BJT and JFET is that BJT is a bipolar device while JFET is a unipolar device. It is so because the operation of BJT is dependent on injection and collection of minority charge carriers that includes both electrons and holes. As against JFET is majority carrier device, thus termed as unipolar. Another major difference between BJT and JFET is that BJT falls under current controlled device category whereas JFET falls under voltage controlled device category. We … [Read more...] about Difference between BJT and JFET
Bandpass Filter
Definition: A bandpass filter (BPF) is an electronic circuit that passes a certain band of frequency without attenuation. The particular band of frequency passes by the filter is known as passband. The important parameters that have to be considered in a BPF are the low and high cut-off frequency, centre frequency along with bandwidth and selectivity. Bandpass filters are basically of two types: Active BPF and Passive BPF. An active bandpass filter requires an external power supply and … [Read more...] about Bandpass Filter
Photoresistor – Light Dependent Resistor (LDR)
Definition: Photoresistor is a type of device whose resistance changes with respect to the intensity of the incident radiation. It has a tremendous ability to change its resistance in exposure to light. LDR is an acronym for Light Dependent Resistor. It is a non-linear device. The photoresistor is also termed as the light dependent resistor or photoconductor as it displays the property of photoconductivity. What photoconductivity basically is? It is the phenomenon which improves the … [Read more...] about Photoresistor – Light Dependent Resistor (LDR)
TRIAC
Definition: TRIAC is basically a 3 terminal ac switch that shows conduction in both the directions. These are triggered into conduction by low energy gate signal. TRIAC is a contraction of TRIode for Alternating Current. It is a bidirectional device that belongs to the thyristor family and is basically a diac with gate terminal used to control the turn-on conditions of the device. Let us have a look at the schematic symbol of a TRIAC: More specifically we can say in TRIAC, Tri denotes … [Read more...] about TRIAC
Voltage Controlled Oscillator (V C O)
Definition: VCO is an acronym for Voltage Controlled Oscillator. It is a device that produces such an oscillating output signal whose frequency can be regulated or altered by the input dc voltage. In other words, we can say, VCO generates an output signal having an adjustable frequency range that is controlled by the dc input voltage. It is a type of oscillator in which the output frequency obtained is the function of the input signal. Usually, the frequency of an oscillator is … [Read more...] about Voltage Controlled Oscillator (V C O)
Difference Between Single-mode and Multimode Optical Fiber
The major difference single-mode and multimode optical fiber is that in single-mode optical fiber light ray propagates only through a single path. On the contrary, in multimode optical fiber several light rays propagate through the waveguide at the same time. Another crucial difference between single-mode and multimode optical fiber is that single-mode fiber has a smaller core diameter as compared to multimode fiber. We will discuss some other important differences between single-mode and … [Read more...] about Difference Between Single-mode and Multimode Optical Fiber
Bistable Multivibrator
Definition: A type of multivibrator whose output consists of 2 stable states is known as Bistable Multivibrator. The circuit switches from one stable state to the other when an appropriate trigger pulse is applied. In a nutshell, in a bistable multivibrator, one stable state can be maintained until a triggering pulse is provided. It is also known as flip-flop multivibrator because due to applied trigger pulses, multivibrator flip from one stable state. And by applying the next trigger … [Read more...] about Bistable Multivibrator
Monostable Multivibrator
Definition: Monostable Multivibrator is a type of multivibrator that has single stable state. MONO means one thus the name itself indicates one state stable and a quasi-stable state. It is also known as a one-shot multivibrator. Here, a triggering pulse is used in order to have transition from a stable state to quasi-stable state. However, no any triggering pulse is provided to have transition from quasi to a stable state. After a pre-determined time interval, the quasi-state returns … [Read more...] about Monostable Multivibrator
Astable Multivibrator
Definition: An astable multivibrator is a type of multivibrator that does not require a triggering pulse thus, sometimes known as a free-running multivibrator. It necessarily provides square wave as its output. Astable multivibrator is called so because both the states present here are unstable i.e., quasi-stable. This means output swings between 0 and 1 and neither 0 nor 1 is the stable state. Here, the successive transition is made from one quasi-state to other after some pre-decided … [Read more...] about Astable Multivibrator
Multivibrator
Definition: An electronic device that produces a non-sinusoidal waveform as its output is known as a Multivibrator. The generated non-sinusoidal waveforms are basically a square wave, rectangular wave, a triangular wave, sawtooth wave, or ramp wave etc. It is a 2 stage RC coupled amplifier that operates in two modes. The modes are basically termed as states of the multivibrator. Basics of Multivibrator The multivibrator is a switching circuit and its basic configuration is shown … [Read more...] about Multivibrator