Electric flute alarm circuit

Published:2011/11/8 21:10:00 Author:Ecco | Keyword: Electric flute alarm, 555 | From:SeekIC

Figure 5.21 shows the tone circuit circuit which can produce two voices with rising tone and dropping tone. Electric flute sound is generated by two generators coupled by optical coupler ( single-junction transistor 2N2648 and the timer 555). 555 generates 0.3HZ frequency signal which makes single-junction transistor VT2 keep this sound increasing or decreasing according to the section.



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