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555 stereo audio equipment remote controller circuit

2017-01-02 20:05  
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555 stereo audio equipment remote controller circuit
As the figure 14-8 shows, the remote controller is composed of the infrared ray coding emitter and the infrared ray decoding receiver. Figure (a) shows the 5-channel infrared coding emitter circuit. The astable multivibrator is composed of the 555 and C1, R6, R1 ~ R5, the oscillation frequency f=1.44/(R1-5+2R6)C1, the five channels are 10kHz,15kHz,20kHz,25kHz and 30kHz. The IC2 is the quad 2-input port NAND gate, the controlled oscillator is composed of the D1 and D2, the oscillation frequency f0=1/(1.4~2.2)RP1C3, f0 of the figure is about 38 to 40kHz. The infrared ray transmitting tube uses the SE303A or the HG4100 series tube. The receiver decoding circuit is composed of the infrared receiver tube, the special decoding circuit, the 5-channel single-tone decoder, the counting circuit and the stereo control circuit.etc.