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Normally the base of a cordless phone has an adaptor and the handset has Ni-Cd cells for its operation. The ba......
The circuit shown here is used to switch on a lamp when the tele- phone rings, if the ambient light is insuffi......
Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circu......
普通红外遥控器作用距离一般为10m左右，且方向性很强。而由HF-15/HJ-15构成的红外遥控发射/接收电路作用距离可达25m，其对射夹角大于15°，且外转电路简单，安装方便。HF-15为红外遥控发射组件，其工作电压4......
dolphin 2009-08-25
dolphin 2009-08-25
dolphin 2009-08-25
dolphin 2009-07-06
