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    • Audio & Sound Circuits
    C = Circuit / Schematic

    Amplifiers

    Op-Amp Mic Preamp C
    Dynamic Microphone Preamp C
    24 Watt Class A Amplifier C
    150W MP3 Car Amplifier C
    Buffer Amplifier C
    Vinyl Pre-Amplifier C
    Class-A / AB Amplifier C C
    Low Voltage Preamplifier C
    Soft switching Amplifier with Tone Controls C
    Cheap 100 to 150 Watt Amp C
    Hi-Fi Preamplifier C
    TDA2030 8 Watt amplifier C
    Stereo Line Driver C
    2 Watt Audio Amplifier C
    Electret Condenser Microphone (ECM) Preamplifier C
    Headphone Amplifier C
    15 Watt Amplifier C
    Quadraphonic Amplifier C
    20 Watt Power Amplifier C
    6 – 10 Watt Stereo Amplifier C

    Audio Level Meters

    Stereo VU Meter C
    Audio Level Meter (vumeter) Circuit C
    Audio Level Meter C
    Peak Reading Audio Level Meter C

    Tone Control Circuits

    6 Input Mixer C
    Voice Scramblers (Change Your Voice) C
    Stereo Mixer C
    Bass-Treble Tone Control Circuits C C
    Five band graphic equalizer using a single IC/chip C
    Three band graphic equalizer C
    Audio Light Modulator / Colored Organ (1 bulb) C
    Audio Light Modulator / Colored Organ (2 bulbs) C
    Audio Light Modulator (picks up sound from built in microphone) C

    Miscellany

    Ultrasonic Dog Whistle C
    Audio Room / Baby Monitor C C
    Simple Intercom Systems C C
    Sound Activated Circuits C C
    Audio Voice-Over Circuit C
    Computer Microphone C
    Notch Filter C
    Infrared headphones C
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    Last updated: August 2006
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