INTRODUCTION:
Since the late 1980s, parametric search, the optimization technique developed by Megiddo in the late 1970s and early 1980s, has become an important tool for solving many geometric optimization queries efficiently. The main principle of parametric search is to compute a value that optimizes an objective function f with the use of an algorithm As that solves the corresponding decision problem. ....etc

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Amplifier circuit


As we have developed dierent models for DC signals (simple large-signal model) and AC
signals (small-signal model), analysis of BJT circuits follows these steps:
DC biasing analysis: Assume all capacitors are open circuit. Analyze the transistor circuit

using the simple large signal mode as described in pages 77-78.
AC analysis:

1) Kill all DC sources
2) Assume coupling capacitors are short circuit. The eect of these capacitors i ....etc

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Audio Amplifier Circuit



In the first part of lab#1 you will construct a low-power audio amplifier/speaker driver based
on the LM386 IC from National Semiconductor. The audio amplifier will be a selfcontained, battery-operated component. In the second part of the lab you will construct a
microphone circuit using a compact electret condenser microphone cartridge. These circuit
modules are important building blocks of many audio communications systems, and will be
used in our ultrasonic transceiver system. ....etc

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Commercial applications usually rely on precompiled parameterized procedures to interact with a database. Unfortunately, executing a procedure with a set of parameters different from those used at compilation time may be arbitrarily suboptimal. Parametric query optimization (PQO) attempts to solve this problem by exhaustively determining the optimal plans at each point of the parameter space at compile time. However, PQO is likely not cost-effective if the query is executed infrequently or if it is executed with values only within a subset of t ....etc

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Mini Mic Pre-Amplifier Circuit based IC LM358



Simple Audio Pre-Amp circuit
Designed based on single Transistor 2N3904, this circuit will provide good gain for weak audio signals such as electret microphone. Easy to build and really simple for pre-amp circuit

Condenser Mic preamplifier
This is a very simple preamplifier circuit for condenser microphone. This mic preamplifier also can be used for dynamic microphone.

You can replace the BC549 ....etc

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Although the use of parametric amplifiers for high frequency, low noise amplification is relatively recent, the principles themselves are not at all new. They were first propounded by Lord Reyleigh in the 1880s for Mechanical Systems and by R. Hartley in 1930s for electrical applications. The need for extremely low noise amplification , as in radio telescopes, space probe tracking and communications, and tropospheric scatter receivers, spurred the design of useful parametric amplifiers in the late 1950s. The low ....etc

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rc coupled amplifier circuit using transistor bc548 ....etc

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power amplifier circuit diagram



Circuit Description
There are many instances where a simple and reliable power amplifier is needed - rear and centre channel speakers for surround-sound, beefing up the PC speakers, low powered tweeter amplifier, etc. For those who want to build their own 'Gainclone' amplifier, this will certainly do the job :-)
This project (unlike most of the others, but in a similar vein to Project 19) is based almost directly on the ....etc

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Digital technology continues its march from media like CDs and DVDs toward your audio speakers. Today, amplifiers based on digital principles are already having a profound effect on equipment efficiency and size. They are also beginning to set the standard for sound quality.

An old idea, the Class D amplifier has taken on new life as equipment manufacturers and consumers redefine the musical experience to be as likely to occur in a car, on a personal stereo, or on an airplane as in a living room. For most consumers today, portability and st ....etc

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Digital Audio's Final Frontier-Class D Amplifier

Digital technology continues its march from media like CDs and DVDs toward your audio speakers. Today, amplifiers based on digital principles are already having a profound effect on equipment efficiency and size. They are also beginning to set the standard for sound quality.

An old idea, the Class D amplifier has taken on new life as equipment manufacturers and consumers redefine the musical experience to be as likely to occur in a car, on a perso ....etc

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