loop circuit causes volume drop... why?

Discussion in 'Effects [BG]' started by sing-modulator, Sep 16, 2018.


  1. sing-modulator

    sing-modulator

    Nov 23, 2014
    IL
    hey all, here's a diy circuit i made so i can use a reverb as like a freeze. when activated, the switch cuts off input to the pedal but allows output to continue. I am a SUPER noob at this stuff, so if this is completely jank, let me know.

    for some reason, when engaged, the pedal in the loop has a serious volume drop. when i disengage, the pedal returns to full volume. i can post a video to show what i mean. i also have included a diagram of my circuit.

    thanks!
     

    Attached Files:

  2. bongomania

    bongomania Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    When you engage it, both the dry and wet signal paths are hard wired to the same output jack point, so they load each other down. To solve this, you will need a buffer circuit, a little active mini-mixer at the point those paths join.
     
    Zane DeBord likes this.
  3. tommiot

    tommiot Commercial User

    Sep 16, 2018
    Helsinki, Finland
    Darkglass Electronics
    Correct. But if you accept a constant 6dB loss and a bit higher output impedance, you could just put a 10k series resistor between return and output, and another one between the switch and output.
     
  4. sing-modulator

    sing-modulator

    Nov 23, 2014
    IL
    do you have a diagram or schematic of a simple one? thanks!
     
  5. bongomania

    bongomania Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs

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