Author: misamaliraza94
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Insulated Gate Bipolar Transistor
The IGBT is a power switching transistor which combines the advantages of MOSFETs and BJTs for use in power supply and motor control circuits. The Insulated Gate Bipolar Transistor also called an IGBT for short, is something of a cross between a conventional Bipolar Junction Transistor, (BJT) and a Field Effect Transistor, (MOSFET) making it ideal as a semiconductor switching device.…
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Triac Tutorial
A Triac is a high-speed solid-state device that can switch and control AC power in both directions of a sinusoidal waveform. Both the thyristor and triac can be used to control lamps, motors, or heaters etc. However, one of the problems of using a thyristor for controlling such circuits is that like a diode, the…
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Thyristor Circuit
Thyristors are high-speed solid-state devices which can be used to control motors, heaters and lamps. In the previous tutorial we looked at the basic construction and operation of the Silicon Controlled Rectifier more commonly known as a Thyristor. This time we will look at how we can use the thyristor and thyristor circuit to control…
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Thyristor Tutorial
In many ways the Silicon Controlled Rectifier, SCR or just Thyristor as it is more commonly known, is similar in construction to the transistor. In this thyristor tutorial we will look at the construction and operation of the thyristor, or Silicon Controlled Rectifier, (SCR) in more detail. In many ways the thyristor is similar in…
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Twin-T Oscillator
The Twin-T Oscillator is another RC oscillator circuit which uses two parallel connected RC networks to produce a sinusoidal output waveform of a single frequency. Twin-T Oscillators are another type of RC oscillator which produces a sinewave output for use in fixed-frequency applications similar to the Wein-bridge oscillator. The twin-T oscillator uses two “Tee” shaped RC networks in…
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Quartz Crystal Oscillators
One of the most important features of any oscillator is its frequency stability, or in other words its ability to provide a constant frequency output under varying load conditions. Quatz crystal oscillators overcome some of the factors that affect the frequency stability of an oscillator. These generally include: variations in temperature, variations in the load, as…
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The Wien Bridge Oscillator
The Wien Bridge Oscillator uses uses two RC networks connected together to produce a sinusoidal oscillator. In the RC Oscillator tutorial we saw that a number of resistors and capacitors can be connected together with an inverting amplifier to produce an oscillating circuit. One of the simplest sine wave oscillators which uses a RC network in place…
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The RC Oscillator Circuit
RC Oscillators use a combination of an amplifier and an RC feedback network to produce output oscillations due to the phase shift between the stages. A single stage transistor amplifier can produce 180o of phase shift between its output and input signals when connected as a common-emitter type amplifier and we can use this configuration to…
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The Colpitts Oscillator
The Colpitts Oscillator design uses two centre-tapped capacitors in series with a parallel inductor to form its resonance tank circuit producing sinusoidal oscillations. In many ways, the Colpitts oscillator is the exact opposite of the Hartley Oscillator we looked at in the previous tutorial. Just like the Hartley oscillator, the tuned tank circuit consists of an LC…
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The Hartley Oscillator
The Hartley Oscillator design uses two inductive coils in series with a parallel capacitor to form its resonance tank circuit producing sinusoidal oscillations. Unlike the Hartley Oscillator, one of the main disadvantages of the basic LC Oscillator tank circuit which we looked at in the previous tutorial, is that they have no means of controlling…