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诗华SA—950R型遥控功放是一台性价比较高的综合功放,无论是欣赏音乐,还是卡拉OK,都有出色表现。但其信噪比太低(厂家所给参数为87dB),因此有必要进行改进和摩机。改进原机中的卡拉OK输出是直接加在IC3 TL082负反馈输入端上的,此电路的缺陷是:只要开机,卡拉OK部分的残余信号就会通过IC3从功放输出,致使噪声较大,在夜深入静时,相距音箱约7m远都能听到2烦人的噪声。改进的具体做法是:利用原机中使用不多的重低音开关,作为卡拉
Shihua SA-950R remote control amplifier is a cost-effective integrated amplifier, whether it is to enjoy music, or karaoke OK, have excellent performance. However, its signal to noise ratio is too low (the factory gives the parameters of 87dB), so it is necessary to improve and motorcycles. Improve the original machine karaoke OK output is added directly to the IC3 TL082 negative feedback input, the circuit’s drawback is: as long as the boot, Kara OK part of the residual signal will be output from the amplifier through the IC3, resulting in greater noise, at Night deep into quiet time, about 7m away from the speakers can hear 2 annoying noise. Improve the specific approach is: the use of the original machine less heavy bass switch, as a karaoke