Friday, 18 November 2016

Schumann Lion

Here is a layout for the rare Schumann Lion distortion.
Original brief description:
"The LION is a distortion device and a clean booster with two complete circuits that can be mixed independently.
Has a bypass footswitch and boost footswitch that gives extra distortion.
Great for bass -- distortion that doesn't cut out the low end.
Great for guitar -- minor chords retain clean harmonics -- you can get great distortion but still hear definition of notes."
You can find original DIY thread and schematic here.

If you want to use Mark's Bipolar Voltage Converter:


  1. anyone care to give a review of this circuit?... personal experience with it? This circuit, at least to the best of my somewhat limited knowledge, isn't based on another effect... I'd love to hear what everyone thinks.

    1. on the diy link they mention the anderton tube sound fuzz/red llama as a basis

    2. The description "booster with two complete circuits that can be mixed independently" let me thing of a clon centaur.

    3. id like to know the same thing that video posted is the only video demo on youtube and the audio in it is horrendous

    4. Hi Alex,
      I've gone over the Funk-a-Duck, and found one small error. I've updated the schematic, it's here;
      You'll see, compared to the first draft, it really makes no difference to the overall layout, it's just true to the original PCB layout.

    5. Thanks Dino! Even for the Schumann Lion!
      If I'm correct the only part that has changed is around the Bypass "box", right?
      Not even sure how that "box" worked but as you've said the layout shouldn't change. Thanks God! :)
      I've tried to reverse engineer a pedal once and I was getting a headache after 5 minutes!
      I don't know how you do it.
      People think it's difficult to draw vero layouts!
      You did a fantastic job as usual.
      Thanks again(from all of us) for all the schematics you've drawn.

    6. No worries Alex. I'm just happy that you are here to help with the layouts. I used to have more time for the vero layouts, so I'm happy to see someone else running with the torch as well! Yes, just a slight rearrangement of the 0 ohm jumpers, but it doesn't really change anything circuit-wise. Please double check to be sure though. Just a clarification on the "Bypass" and "Env_Out" boxes on my Funk-a-Duck schematic. These are not actually anything physical on the board, they are just unused pads on the PCB. Maybe there was a plan for an external jack for the envelope that didn't happen? Maybe the bypass arrangement originally intended didn't work out because of popping issues, hence the caps and resistors placed directly on the bypass switch? I don't know, but the schematic reflects the how, what, and where of the original. All pictures of the boards are here;
      If you look on the left side corners of the main PCB, you see the unused pads for the "Bypass" and "Env Out". Thanks again for this wonderful site, dedicated to us "veroheads". Viva la verolution!!

  2. I was going to make a pcb from the schematic but you saved me the hassle, cheers Alex. Can't wait to build it but still waiting for jacks.

  3. This comment has been removed by the author.

  4. Call this verified!!
    Leds don't work though.
    It sounds awesome and rich, very cool. Thanks.

    1. Thanks Giò!
      I don't understand why the Leds don't work.
      They are wired as usual to +12V.
      Did you add all cuts?
      Do you get + & -12V on the transistors' outputs?

    2. I'm trying different solutions. I erased all the issues by linking the 2 "LED+" together, to a wire out of the 2nd row from above (row under "+18 volt") and putting the "CLR" resistors on the "LED-" (between switch solder joint and LED-). I got some noises etc, doing this it works. Without leds the pedal works perfectly btw, for sure I have some weird problem with wiring these two.

    3. Hey!
      Carefully checked my build again for bad solder joints, wrong bridges etc. since I was changing a couple capacitors to smaller ones (just for the size, values are ok), the final result seems pretty similar to the one in the video demo, and LEDs are ok now. Though occasional scratch noises remain while playing at low volume. I don't have one at hand to make a direct confrontation, but it seems like the 4049 (I have the UnBuffered of course) works badly. My build is 100% like the one in the layout. Did someone succeeded with his built? :)

  5. This comment has been removed by the author.