Matching technology of infrared transmitting tube and receiving head

　　The receiving distance of the receiving head, in addition to the receiving performance of the receiving head itself, is also related to the transmitter tube, to the market when selling the transmitter tube said that my transmitting distance is how many meters; Or sell the receiving head to say that my receiving distance is how many meters, both of these words can be said to be a mistake. In theory:

　　The receiving distance of the receiving head is proportional to the transmitting power of the transmitting tube, for the same receiving head, different transmitting tubes, the receiving distance is not the same, the greater the power, the farther the receiving distance, and vice versa.

　　The transmitting power of the transmitter tube is inversely proportional to the transmitting Angle, many people hope that the larger the transmitting Angle of the transmitter tube, the farther the transmitting distance is, the better, of course, this is impractical, there are two kinds of transmitting tubes used on the market at present, mainland chips (represented by Olund) and Taiwan chips (represented by Guanglei and Dingyuan) are produced, there is a price difference of a few cents. Generally the cheaper ones are made with chips made in China; What's the difference between the two?

　　1. The transmission power of chips made in China is relatively low

　　2. The Vf value of the mainland chip is high, and the current value that it can withstand is much lower, which is prone to the phenomenon of dead lamps.

　　3. The attenuation of mainland chips is greater

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