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使用不带遥控器的电视机换频道时,需手动操作,如把图1电路装在电视机内,便可实现遥控选台。电路原理:图1 C 157是十进制计数器,它随着CL脉冲的输入,在输出端依次出现10个高电平, 其最大负载电流为0.3～3mA,此电流分别经BG_1～BG_4放大后,流过干簧继电器,使其内部两个干簧管均闭合导通。把两个干簧管引线分别接到电视机上频道选择按钮的两个开关上。每当继电器通电时,两个干簧管导通,相当于把频道选择钮按下,从而进行选台。
Use without remote control TV for channel, the need for manual operation, such as the circuit in Figure 1 installed in the TV, remote control can be selected. Circuit principle: Fig. 1 C 157 is the decimal counter, it follows CL pulse input, appear 10 high level at the output end in turn, its maximum load current is 0.3 ~ 3mA, this current is amplified by BG_1 ~ BG_4 respectively, flow Reed relay, so that the two internal reed switch are closed conduction. Connect the two reed switch leads to the two switches of the channel select button on the TV. Whenever the relay is energized, the two reed switches are on, which is equivalent to pressing the channel selector to select the station.