Five-use tri-state audio logic pen ( CD4066 , 555 )

Published:2013/1/24 1:43:00 Author:Ecco | Keyword: Five-use, tri-state , audio logic pen , 555 | From:SeekIC

The circuit is mainly composed of multivibrator, four bidirectional switch CD4066 (IC1) and gate circuit with some resistive and capacitive components. The multivibrator 555 (IC2) consists of R7 , R8 , R9 and C1, and its oscillation frequency is affected by the off state of IC1-3.



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