is 5V to 15V DC. The heart of the circuit is a CA3140 IC that is working in comparator mode in the circuit. The 10K variable resistor is used to adjust sensitivity of the circuit. Two transistors 2N3904 and BD140 are connected with pin6 of the IC to amplify the output signals.



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This is a project of a sound controlled motor using an opamp and few other components. The circuit will activate a DC motor when the microphone used in the circuit will receive any sound. The circuit is using an apamp IC and few other components and can be operated from a wide range of supply that
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Sound Controlled DC Motor Circuit Diagram