Five uses tri-state audio logic pen (CD4066 555) circuit diagram

  
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Five uses tri-state audio logic pen (CD4066, 555) circuit diagram is shown as the chart. The circuit is mainly composed of the multivibrator, the four-way switch CD4066 (IC1) and the gate circuit composed of some RC components. Multivibrator is composed of the 555 (IC2) and R7, R8, R9, C1, and its frequency is controlled by IC1-3 on-off state.
Five uses tri-state audio logic pen (CD4066 555) circuit diagram - schematic




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