Laguna State Polytechnic University -San Pablo City CampusBrgy. Del Remedio, San Pablo City, Laguna

In partial fulfillment of the requirements inECE 327

Electronic Circuit Analysisand Design

Submitted by:Casiquin, AlixisConstantino, KennethMontano, Ron Lenard

Submitted to:Engr. Mia Capuno

February 28, 2014Background of the Study

Amplifiers are electronic circuit that transform a weak signal into a more powerful one with a greater voltage or current. They are often described by the technology of the amplifying device used. Solid-state amplifiers employ semiconductor devices such as transistor and integrated circuits. Tube amplifiers employ vacuum tubes.One way of classifying amplifier is according to the frequency range of the signal they can handle. An audio amplifier handles the frequencies of sounds audible to the ear, from below 20 hertz (cycle per second) to more than 20,000 hertz (20 kHz).The basic principle of electronic amplifier was established in 1907, when Lee De Forest invented the audion, or triode, tube. If a small signal voltage is fed to the tubes control grid, it produces a larger signal voltage (with the same pattern of variation) in the tubes circuit. The ratio of output to input voltage is the circuits gain. Transistor amplifier circuits operate in analogous manner. In effect, the amplifying device (tube or transistor) acts as an electronic valve. The input signal controls the valve, causing it to modulate the current or voltage from the power supply. As a result, the output signal from the power supply becomes a magnified copy of the input signals waveform.The quality and usefulness of an amplifier depend on several factors. These include its frequency response (the range of frequencies for which the output signal is an accurate copy of the input), its freedom from distortion (errors that cause the output signal to be an inaccurate copy of the input), and its maximum output.Courtesy: Grolier Encyclopedia of Knowledge

MaterialsTypeSpecificationQuantity

Resistors10 1

1 k2

1.5 k1

3.3 k1

10 k2

15 k1

560 k1

Tuner50 k2

1 M1

NPN TransistorC-8281

Capacitors.00221

.014

.13

4.7 F4

47 F2

100 F3

1000 F1

Integrated Circuit1