four coding remote control regulating light switch circuit

Published:2011/7/12 3:41:00 Author:Lena | Keyword: four coding, remote control, regulating light, switch | From:SeekIC

1. remote control transmitting circuit. This circuit is shown in figure 1. It consists of infrared coding remote control transmitting integrated circuit PT2248. The oscillating end has 500kΩ resistance internally, so it only needs external connecting ceramics filter or LC series resonance circuit, then it can generate surge to make the circuit work, in the figure 1, X1 is a 455kHx ceramics filter. ～pin and ～pin of PT2248 form keyboard matrix, this remote control switch only uses four keys which is marked with number 1, 2, 3, 4, to control the four receptors respectively.



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