Power amplifier circuit for audio signal and audio device using the same

1996 ◽  
Vol 100 (3) ◽  
pp. 1281
Author(s):  
Kei Nishioka ◽  
Masanori Fujisawa
Keyword(s):  
Power Amplifier ◽  
Audio Signal ◽  
Amplifier Circuit ◽  
Audio Device

Audio Power Amplifier Design and Debugging

2014 ◽  
Vol 651-653 ◽  
pp. 2269-2272
Author(s):  
Ji Xiu Liang ◽  
Shou Kui Li
Keyword(s):  
Power Amplifier ◽  
Integrated Circuit ◽  
Audio Signal ◽  
High Fidelity ◽  
Hearing Level ◽  
Large Power ◽  
Power Amplification ◽  
Response Range ◽  
Amplifier Design ◽  
Quality Guarantee

The modern demands for hearing level is getting higher and higher, so the authenticity of stereo sound quality demand is higher and higher, the stereo power amplifier is integrated circuit TDA2030A primarily composed of stereo power amplifier, it USES the typical power amplification circuit, with less distortion, peripheral components, high stability, wide frequency response range, high fidelity, the advantages of large power, at the same time adopt SiYun put GL324A of input audio signal processing and high, bass, and thus more output sound of quality guarantee. Articles of amplifiers made simple introduction, and give the detailed design and debug program.

scholarly journals Increasing the time resolution of a pulse width modulator in a class D power amplifier by using delay lines

2014 ◽  
Vol 12 ◽  
pp. 91-94 ◽  
Author(s):  
M. Weber ◽  
T. Vennemann ◽  
W. Mathis
Keyword(s):  
Power Amplifier ◽  
Time Resolution ◽  
Pulse Width ◽  
Audio Signal ◽  
Open Loop ◽  
Delay Lines ◽  
Class D ◽  
Ac Power ◽  
Pulse Width Modulator ◽  
Power Stage

Abstract. In this paper, we present a method to increase the time resolution of a pulse width modulator by using delay lines. The modulator is part of an open loop class D power amplifier, which uses the ZePoC algorithm to code the audio signal which is amplified in the class D power stage. If the time resolution of the pulse width modulator is high enough, ZePoC could also be used to build an high accuracy AC power standard, because of its open loop property. With the presented method the time resolution theoretically could be increased by a factor of 16, which means here the time resolution will be enhanced from 5 ns to 312.5 ps.

The Design and Simulation Analysis of Current Amplifier Circuit of Relay Test

2012 ◽  
Vol 466-467 ◽  
pp. 966-970
Author(s):  
Bai Fen Liu ◽  
Xian Wu Fang ◽  
Yun Chen
Keyword(s):  
Theoretical Calculation ◽  
Output Power ◽  
Power Amplifier ◽  
Simulation Analysis ◽  
Amplifier Circuit ◽  
Current Amplifier ◽  
Reliable Design

This article proposes a practical and reliable design applicable to DC output power amplifier circuit of relay tester. Through theoretical calculation, the author discuss the amplifier circuit can meet the requirement of relay tester to output, and supply the design and simulation analysis of power amplifier circuit, and expatiate the functions of each module of the circuit. The simulation analysis proves that this circuit is a efficient, stable and feasible conversion circuit which can amply energy.

Design and Simulation of a Microcontroller Based Loudspeaker Protection System Against Amplifier Direct Current (D.C) Offsets

2016 ◽  
Vol 8 ◽  
pp. 12
Author(s):  
Abiodun Ogunseye ◽  
Olamide Omolara Olusanya
Keyword(s):  
Failure Mode ◽  
Power Amplifier ◽  
Direct Current ◽  
Failure Modes ◽  
Failure Mechanisms ◽  
Protection System ◽  
Amplifier Circuit ◽  
Switching Transistor ◽  
Detection Circuit ◽  
Critical Components

A number of failure mechanisms can result in the damage of loudspeakers that are directly connected to an audio power amplifier system. One of such failure modes occurs when the amplifier circuit develops an output d.c voltage, in which case, the loudspeaker coil will be damaged by overheating. D.c offset detection circuits, usually based on simple transistor circuits are normally used to protect the loudspeaker against this failure mode. However, as effective as they are, these circuits can fail in ways that can result in loudspeaker damage. In this work, a microcontroller based circuit that monitors the critical components of a loudspeaker d.c detection circuit, namely the switching transistor and the isolating relay circuit was developed. The hardware of the developed circuit was modelled with Proteus® software and its firmware was written using MikroC® software. The modelled circuit successfully detects the presence of d.c signals and also reports the states of the isolating relay and the switching transistors when these components fail.

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