555 simple TV channels transformation remote controller circuit

Published:2011/6/15 20:54:00 Author:TaoXi | Keyword: 555, simple, TV channels, transformation, remote controller | From:SeekIC

This remote control circuit uses the dual time base circuit 556 as the core, the circuit is as shown in figure 14-32. In this figure, the astable multivibrator is composed of the IC1-a (1/2 NE556) and R2, RP1, C1, the oscillation frequency f1=1.4/(RP1+2R2)C1, you can make the resonance frequency to 1Hz by adjusting RP1. The output of it supplies the trigger pulse to the IC1-b(1/2NE556) time base circuit. The audio oscillator is composed of the IC1-b and R4, R5, C4. When there is the high level pulse, the audio oscillator starts working, the oscillation frequency f2=1.44/(R4+2R5)C4, the oscillation frequency of the figure parameters is about 2kHz. The pulse sequence is drived by VT1 to make the infrared launch tube LED to send out the 2kHz infrared modulation light.



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