vu meter with led

Posted on Feb 7, 2014

If you are making a stereo amplifier, or if you own one already, then do not hesitate to add this circuit. The entire circuit is wired around IC4017 whose clock input is tapped through transistor BC107. Basically, IC 4017 is a 1-of-10 decade counter or a decoder. To suggest the design, this circuit fills the gap between a simple 1-transistor sound

vu meter with led
Click here to download the full size of the above Circuit.

-to-light and a unit using filter and main LEDs. But two units must be added for stereo operation. Circuit calibration is straight forward and should present no problem. The effect of sound reaching the input is to trigger IC to count one. This means that when the music gets louder, the LEDs move faster. If you wish to use fewer LEDs, a wire must link from the next LED and should go on to reset pin 15. Note that pin 12 doesnot have any connection. To tap the input to this circuit, it is advised to tap the output from the main speakers. VU Meter with LED If the LEDs do not move rapidly according to the music pitch, adjust VR1. If two LEDs are in parallel, the second one can be pointed towards the viewer for added effect.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Theremin Circuit
    15V And 5V Car Battery Supply
    12V Auto-Powered Circuit For Cassette Recorders
    The Ultimate Audio Filter
    Micro-Ohm Meter Senior Project Page
    light beam circuit
    Stimulated simple motor speed control circuit
    Pre-dividing power amplifier
    Synchronous controller circuit diagram of a recording transcript