LED bar peak program meter display for audio

Posted on Oct 27, 2012

A bar column of LEDs is arranged so that as the audio signal level increases, more LEDs in the column light up. The LEDs are arranged vertically in 6 dB steps. A fast response time and a one second decay time give an accurate response to transients and a low `flicker` decay characteristic. On each of the op amps inverting inputs is a dc reference voltage, which increases in 6 dB steps. All noninverting inputs are tied together and connected to the positive peak envelope of the audio signal

LED bar peak program meter display for audio
Click here to download the full size of the above Circuit.

Thus, as this envelope exceeds a particular voltage reference, the op amp output goes high and the LED lights up. Also, all the LEDs below this are illuminated.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Sound Operated Switch
    Car central Light Dimmer
    2N3055 and LM723 3-30 V/2.5 A Stabilized power supply
    DIY Welder Control Board
    Klee Sequencer Circuit Theory of Operation
    DC-Coupled Audio Amplifier Circuit
    Team Hovercraft
    TrikiBoard 8052
    Remote control transmitter circuit
    Gentleman AM50 amplifier circuit
    Phase solid state relay fault protection circuit b