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

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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