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近来,许多放大器都装有D/A转换器及带有视频输入功能。雅马哈公司的AX—640型前置、功率放大器就属于这种放大器,它采用了AST主动伺服技术。以下就其原理及频率响应进行详细说明。抑制机内信号干扰前置、功率放大器基本上是由前置放大器和功率放大器两部分组成。前置放大部分由输入选择器、音量控制、音调控制等音质调整电路构成,功率放大部分用于驱动扬声器。由于前置、功率放大器同时存在弱信号输入和强信号输出,因此在工作时强信号往往会对弱信号产
Recently, many amplifiers have D / A converters and video inputs. Yamaha’s AX-640 front-end, power amplifier belongs to this amplifier, which uses the AST servo technology initiative. The following principles and frequency response to explain in detail. Prevent signal interference within the machine front, the power amplifier is basically preamplifier and power amplifier composed of two parts. Preamplifier part by the input selector, volume control, tone control and other sound quality adjustment circuit, the power amplifier part is used to drive the speaker. Due to the front, the power amplifier weak signal input and strong signal output at the same time, so strong signal at work tend to weak signal production