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目前购得HT-168L型无绳电话机(香港汇通公司产品)一部,性能较好,只是主机音量较小,没有一般电话免提时音量大,与手机通话时离得稍远便听不清。因该机未附图纸,故打开主机机壳,从线路上分析出主机使用一片LM386集成电路来进行放大,其接线如图所示。LM386是一种性能优良的小功率音频放大电路,其①、⑧两脚间可通过阻容元件调节增益和音质,最大增益可达200。而该机不知是为减少外围元件,还是为避免
Currently available HT-168L-type cordless phone (Hong Kong Huitong company products) a better performance, but the host volume is small, there is no general volume when the speakerphone is not large, when the phone call away from a little can not hear . Because the machine is not attached to the drawings, so open the host chassis, from the line analysis of the host using an LM386 integrated circuit to be amplified, the wiring shown in the figure. LM386 is a high-performance low-power audio amplifier circuit, the ①, ⑧ feet between the RC components can be adjusted gain and sound quality, the maximum gain of up to 200. The machine I do not know is to reduce the external components, or to avoid