voltage controlled filter

Discussion in 'The Projects Forum' started by Spence, Apr 16, 2011.

  1. Spence

    Thread Starter Member

    Apr 23, 2010
    Google not being too helpful on this, I need a voltage controlled filter circuit or ideas, nothing too complicated or fancy, it's my first analog synth project.

    When a keyboard key is pressed, the control voltage needs to iniciate the bandpass filter to sweep upwards in frequency, slowly.

    I got something working with a twin t filter and ldr but it's getting messy and it's not smooth.