Audio Level Meter (VU Meter)


Posted on Feb 5, 2014

This circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display.


Audio Level Meter (VU Meter)
Click here to download the full size of the above Circuit.

LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The IC contains an adjustable voltage reference and an accurate ten-step voltage divider. The high-impedance input buffer accepts signals down to ground and up to within 1. 5V of the positive supply. Further, it needs no protection against inputs of ±35V. The input buffer drives 10 individual comparators referenced to the precision divider. Accuracy is typically better than 1 dB.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Logic-Level actuated gas solenoid
    commodore 64c
    FET Audio Mixer
    HOLTEK 9200B & 9170B DTMF Generator & Receiver
    Coin Toss Circuit
    Class B audio amplifier
    Electrical Maintenance
    ksb3 timer
    INA331 332 configured to directly drive the capacitive input A D converter circuit



    Top