Five functions ultrared remote control receiving circuit diagram

Published:2011/5/5 21:26:00 Author:Nicole | Keyword: function, ultrared remote control, receiving | From:SeekIC

The figure1 is a five functions ultrared remote control receiving circuit. In the figure 1(a), SDA205 is ultrared remote control receiving decoding integrated circuit, after it receives a series of instructions which is sent by transmitting circuit, it will start to work. If the instructions are program advances P+ and program advances P- , then the ring counter has 16 channels selection, it outputs A, B, C, D. If the instruction is simulation+ and simulation - it can be used for voice controlling(output UOL). The fifth function is ON/OFF , when it is off, the device is in standby state, PC terminal outputs high level, TV's channel transformation is no effect. If it is changed into the circuit as shown in the figure1(b), it still can be remote controlled, swtich S1 is pressed, then VT2 turns on, standby output terminal ON/OFF is enforced into low level. When input PC is high level, for the ring counter, it is program advances P+ . In standby action, PC output is high level, because it is connected to diode VD1, VT2 turns off, so it is no influence on circuit. K1 is standby relay.



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