Five uses tri-state logic audio pen CD4066 555

  
As shown in Figure five uses tri-state logic pen audio circuit. The circuit mainly by the multivibrator, four-way switch CD4066 (IC1) circuit with some RC com
Five uses tri-state logic audio pen CD4066 555 - schematic

ponents consisting of other components. Wherein the multivibrator 555 (IC2) and R7, R8, R9, C1 constituted by the oscillation frequency off IC1-3 state control.




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