Volume Sequencer

Discussion in 'The Projects Forum' started by butler2710@gmail.com, Nov 20, 2006.

  1. butler2710@gmail.com

    Thread Starter New Member

    Nov 20, 2006
    I'm trying to create a simple sequencer which sets the volume of an audio input. It doesnt amplify the signal at all, just varies the resistance on the audio signal to reduce the volume.

    The circuit has 8 pots with an LED underneath each. The LEDs light in sequence. When each LED is lit, the resistance changes to the value of the pot above.

    I've written a PIC program to send an output to 8 pins in sequence which lights the LEDs in sequence, but I'm not sure now I link this to the audio wave. Any ideas? Thanks for your help.
  2. beenthere

    Retired Moderator

    Apr 20, 2004

    Think about some DIP relays that will pull in with the LED's to put each pot in circuit. If your voltage is right, you may be able to use the relay coils in place of the current limiting resistors.
  3. EngineerJoe


    Nov 4, 2006
    Don't forget about Quad Bilateral Switches! Makes for a nice solid state solution compared to power hungry relays.....
  4. Gadget

    Distinguished Member

    Jan 10, 2006
    Yup, that was gonna be my suggestion as well.... CD4066/4016 or the CD4051 depending on how you go about it.... (the 4051 is effectively an 8 position analogue switch addressed via 3 bits.... the 4066/16 are 4 analogue switchs in a single package with individual controls).
  5. butler2710@gmail.com

    Thread Starter New Member

    Nov 20, 2006
    thanks a lot! the quad bilateral switches is the kind of thing i was thinking of - an electronically controlled switch - i just didnt know what they were called.