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光控交流电源插盒可用普通手电筒光线作遥控指令,在数米距离内按动手电开关,即可控制插盒电源的通断,电路如图1所示。装在一个塑料盒内,可随意放在不同的地方使用,十分方便。1.电路工作原理把插头 XP 接上市电,接通电源开关 S,IC(LA7812)的②脚和③脚间输出稳定的直流12V 电压,供电路使用并点亮电源指示灯 VD3。当用手电光照射光敏电阻 RL2时,RL2即呈低电阻状态,使三极管 V3导通,继电器K2通电吸合。由于此时光敏电阻 RL1未受到手电光的照射呈高电阻状态,因而三极管 V1截止,V1的 c 极为高电位令三极管 V2导通,继电器 K1通电吸合,插座 XS 得电,使其所接的用电器工作,K1的常开触点 K1-2同时闭合作自锁用。欲要 XS 失电,可用
Light control AC power box can use ordinary flashlight light for remote control commands, within a few meters by pressing the flashlight switch, you can control the plug box power on-off, the circuit shown in Figure 1. Installed in a plastic box, are free to put in different places to use, very convenient. 1. The circuit works Connect the plug XP to the mains, turn on the power switch S, IC (LA7812) ② feet and ③ pin output stable DC 12V voltage for the circuit and use the power indicator light VD3. When the flashlight is irradiated with the light-sensitive resistor RL2, RL2 is in a low-resistance state, so that the transistor V3 is turned on and the relay K2 is energized and shunted. Since the photosensitive resistor RL1 is not illuminated by the flashlight at this time, the resistance of the flashlight is in a high resistance state, so the transistor V1 is turned off and the V1 of the C1 is at a high potential, so that the transistor V2 is turned on and the relay K1 is energized and sucked. With electrical work, K1 normally open contact K1-2 at the same time closed for self-locking purposes. To lose power XS, available