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画佳HJ—2688遥控增补器适用于无遥控功能的普通彩电,使之具备遥控功能,且使普通彩电能接收增补频道,它是一种机外形遥控增补器,不需打开彩电后盖进行处理,只需按说明书接好线即可。图1是其电路原理图,系笔者依据实物绘制而成。一、工作原理 1.遥控系统 IC1 是CTV222S.PRC1.IC微处理器,它与PCA84C444相当,是一种电压调谐选台的遥控系统。其电路主要包括微处理正常工作支持电路、调谐选台电路、模拟量输出电路、屏幕显示电路、I~2C总线与存储电路、本机键盘矩阵电路、遥控信号输入及待机/开机
Painting good HJ-2688 remote supplements for ordinary remote control without color TV, so that it has a remote control function, and make ordinary TV to receive additional channels, it is a remote control device shape supplements, do not need to open the rear cover for processing color TV Just follow the instructions to connect the line. Figure 1 is the schematic circuit diagram, the author based on the actual drawing. First, the working principle 1. Remote control system IC1 is CTV222S.PRC1.IC microprocessor, which is equivalent with the PCA84C444, is a voltage tuning station selection remote control system. Its circuit mainly includes the normal working support circuit of microprocessing, tuner selection circuit, analog output circuit, screen display circuit, I ~ 2C bus and storage circuit, local keyboard matrix circuit, remote control signal input and standby / power on