555 multi-function sound generator

Published:2011/6/15 4:58:00 Author:TaoXi | Keyword: 555, multi-function, sound generator | From:SeekIC

As the figure 14-28 shows, the sound generating circuit is composed of the 556 and CD4051, this circuit can produce the single, dual-tone and rhythm-style sound. The astable oscillator is composed of the IC's left part (1/2 556) and R1, R2, C1, f=1.44/(R1+2R2)C1, the oscillation frequency of the figure parameter is 2Hz, it's output port pin-5 is connected with the public input / output port (pin-3) of IC2, IC2 is the 8-channel analog switch CD4051, the port A and port B control one channel's connection of this switch. The sound oscillator is composed of the IC1(1/2 556) and the R3, R4, C2. When A=0，B=0, this circuit outputs the double audio frequencies sound signal; when A=1，B=1, the 2Hz signal which is produced by the left part of IC1 does not play the control function until it outputs the single-tone with the frequency of 900Hz.



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