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Amplitude Modulation

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength (amplitude) of the transmitted signal in relation to the information being sent. For example, changes in signal strength may be used to specify the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels. This contrasts with frequency modulation, in which the frequency of the carrier signal is varied, and phase modulation, in which the phase is varied, by the modulating signal.

AM was the earliest modulation method. In the mid-1870s, a form of amplitude modulation—initially called "undulatory currents"—was the first method to successfully produce quality audio over telephone lines. Developed during the first two decades of the 20th century beginning with Reginald Fessenden's radiotelephone experiments in 1900, AM was the original method used for transmitting sound by radio. It remains in use today in many forms of communication; for example it is used in portable two way radios, and in computer modems. "AM" is often used to refer to its largest remaining use, mediumwave AM radio broadcasting.

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Servomotors

A servomotor is a rotary actuator that allows for precise control of angular position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servomotors.

Servomotors are not a different class of motor, on the basis of fundamental operating principle, but uses servomechanism to achieve closed loop control with a generic open loop motor.
Servomotors are used in applications such as robotics, CNC machinery or automated manufacturing.

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Flow Of Electrons And Holes in a Transistor.

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Simple Audio Amplifier Circuit Using LM386..

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Evolution of the Generation

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LM386 Audio Amplifier.

The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.

The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the LM386 ideal for battery operation.

A nice feature of the LM386 is that it can drive a small speaker. This allows for an easy design and test of the amplifier in isolation, using a portable music player and a desktop speaker. Once the amplifier works fine, adding a microphone to complete the sound sensor should be easy.

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