555 sound control floodlight circuit

Published:2011/5/21 23:08:00 Author:TaoXi | Keyword: sound control, floodlight | From:SeekIC

As the figure 17-49 shows, the sound control circuit is composed of two parts: the transmitter and the receiver. The astable multivibrator is composed of the 555 and RP1，RP2，R1，C1, the oscillation frequency f=1.44/(RP+2R1)C1, the parameters in the figure have the oscillation frequency of about 1～40kHz, the oscillation frequency is adjustable. It drives the high-pitched loudspeaker through VT1. The IC1 of the receiving circuit uses the special whistle integrated circuit KD-154, and the KD-154 is very sensitive to the high voice frequency of 18kHz, when debugging, we adjust RP1 and RP2 to send out the 18kHz audio frequency to drive the KD-154. The HTD is the pickup.



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