Tone Detector / Sound Activated Switch

The following circuit diagrams are tone detector circuit diagrams which also known as sound activated switch circuit. Actually, these circuits? use microntroller for switching because the circuits were designed for robot start up activation. But you can build switching module using relay. You may make a trial to use this circuit for other applications such as to automatically turn on the lamp, anti theft or security applications.

Tone Detector diagram 1

Tone Detector circuit diagram schematic

Tone Detector diagram 2

Tone Detector schematic diagram

Tone Detector diagram 3

Tone Detector circuit

Tone Detector diagram 4

Tone Detector diagram

Tone Detector diagram 5

Tone Detector circuit diagram

Circuit source: Sound activated switch for robot

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