op amp based sound detector circuit


Posted on Feb 4, 2014

This is a circuit that can be used for detecting sounds and providing an output signal when a sound is detected. This output signal may be fed to another circuit that sets off an alarm when the signal is received. This circuit is therefore useful in security applications. This is the figure of the circuit; The circuit uses a condenser microphone t


op amp based sound detector circuit
Click here to download the full size of the above Circuit.

o pick up sounds from the environment. This is a powered microphone, which makes it more sensitive than ordinary microphones. The microphone transforms the sound waves into an electronic signal that is fed to the 741 op amp. The 741 op amp in this circuit is configured as a single-supply inverting amplifier. Adjust R1 to maximize the sensitivity of your circuit. C1 and C2 are used to block the DC component of the signals, so that only the AC component carrying the sound information reaches the output transistor Q1. Note that the output, which is taken from the collector of Q1, is inverted with respect to the output of the 741 amplifier.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Light Sensor Switch
    Peak detect and hold
    Step Variable Dc Supply
    5V Dial Tone Circuit Circuit
    The 555 Door Alarm
    220V LED Flasher circuit diagram
    l297 stepper motor controller circuits
    field strength meter fsm
    periodic timer
    Audio clipping indicator circuit
    PS10 Quad Power Sequencing Controller - Supertex Inc
    Telephone privacy circuit
    MFOS Micro-Sample & Hold circuit
    LM Frequency Meter



    Top