This circuit is composed of encoder VD5026 and laser flashlight, among which A1~A11 are address lines, whose logic states can be 1, 0 or suspended. Different combinations of address lines can obtain different pulse strings at the output end D0 to modulate the emission of the laser flashlight, that is, tens of thousands of different sets of coded data can be transmitted through the laser. Coding receiving circuit: This receiving circuit is composed of amplification and shaping circuits composed of photoelectric devices and operational amplifier LM358. The received signal is sent to the input end DI of VD5028 for decoding (the states of A1~A11 of VD5028 and VD5026 must be consistent). When the decoding is correct, a low level is output at the VT end to trigger the control execution circuit behind to make a sound. Coding receiving circuit composed of VD5026+laser flashlight:
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