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Astable Multivibrators And Amplifiers Essay

942 words - 4 pages

At the beginning of this quarter, we decided to buy a circuit we could build on our own to practice soldering. We bought the flashing LED sweetheart and while building the circuit we realized that it was an astable multivibrator. An Astable multivibrator switches between two states without stopping by using their output signal to recharge the input signal. This works because of a transistor or amplifier that amplifies the output signal and forwards the charge to the input. In most astable multivibrators there are two capacitors in between the input and output terminals, one is fully charged and the other is fully discharged, which allows voltage levels to be stepped up or down. As the ...view middle of the document...

Although the amplifier restores the lost energy when it amplifies the signal, the signal will be too small to be of any use. The basic transistor circuit for an astable multivibrator produces a square wave output from a pair of grounded emitter cross-coupled transistors. Both transistors either NPN or PNP, in the multivibrator are biased for linear operation and are operated as Common Emitter Amplifiers with 100% positive feedback.
Amplifiers, which are devices that have varying input signals and produces an output signal that varies just like the input but on a larger amplitude. The large output signal contains the essential waveform features of the input signal. The input signal might be a current, voltage, mechanical motion, or any other signal; the output is usually of the same nature as the input. There are many ways to use amplifiers in an electronic equipment such as, radio and television receivers, high-fidelity audio equipment, and computers. The most common type of amplifiers have transistors or electron tubes as their principle components. A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. A transistor is composed of semiconductor material with at least three terminals for connection to an external circuit. Amplifiers in the simplest form are built around a single transistor. In a single transistor amplifier, or common-emitter circuit, the input voltage is fed to the base of the transistor, and the output appears at the transistors collector; the ratio of the output voltage to the input voltage is called the voltage gain. A bipolar junction transistor (BJT) is a type of transistor that counts on the contact of the two types of semiconductor for it to work. BJT’s can be used as amplifiers, switches, or an oscillator. It is called...

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