Multi-functional remote control circuit (555, LM909)

Published:2011/8/26 0:56:00 Author:TaoXi | Keyword: Multi-functional, remote control | From:SeekIC

The multi-functional remote control circuit is as shown in the figure, this circuit is composed of the generator and receiver. The transmitter is composed of the astable multivibrator, the audio-frequency generator and the RF oscillator. The receiver uses the LM909. The multivibrator is composed of the IC1 (555) and R1, R2, R3, C3, you can change the charging and discharging time constant by using the switch K1. When K1 is in the position 1 , the duty cycle D=(R2+R3)/(R1+R2+R3+R4)≈60％; when K1 is in the position 2 , the duty cycle D=(R2+R3)/(R1+R2+R3+R4)≈30％; When K1 is in the position 3 , the duty cycle D=(R2+R3)/(R1+R2+R3+R4)≈100％(pin-3 of IC1 outputs the low level signal).



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