红外遥控电子密码锁的最大特点是免记忆密码，只要设置好密码，每次只需按一下遥控器上的发送功能键“F”即可开启电控锁体，从而给人们的生活带来了极大方便，而对记忆力差的老人来说更是如此。该电路的红外线发送管使用PH303，红外线接收管使用中心频率为40kHz的NJL41V40［1］，该器件内部含有红外线PIN接收管、选频放大器以及解调器。-Infrared remote control key lock feature is the largest free memory password, the password is set up as long as each click on the remote control to send function keys " F"　to open the electronic control lock body, thereby to bring about people' s lives a great convenience, but poor memory, especially for the elderly. The circuit is the use of infra-red send PH303, infra-red receiver for the use of the center frequency of 40kHz the NJL41V40 [1], the device includes an internal PIN to receive infra-red tube, selective frequency amplifier, and demodulator.