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Thursday, 8 December 2022

Sarno Earth Drive

 Traced by GratefulEight, this overdrive seems like a circuit worth to try out.

From the source: The Earth Drive is the ultimate boost/overdrive pedal, designed to retain your instrument's natural character while providing an organic, full-bodied, yet transparent sound.

Use the Earth Drive as a clean boost to add warmth and smoothing, or turn up the drive knob and get a wide spectrum of overdrive harmonics and singing sustain. The Earth Drive has a huge range of boost control with its volume knob, while the tone knob helps you perfectly dial in the treble response.

Whether you play bass, pedal-steel, electric piano, electric guitar, organ, whatever, the Earth Drive is quite possibly the most useful and versatile drive pedal you've ever heard.





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20 comments:

  1. refused8 December 2022 at 16:51

    Tone knob value is missing

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    Replies
    1. mirosol8 December 2022 at 17:25

      Not anymore. Thx.
      +m

      Delete
    2. refused9 December 2022 at 18:33

      also missing a cut for D5.

      I haven't built it yet but it's interesting me. I will this weekend and report back.

      Delete
    3. Voodooslideg21 December 2022 at 14:32

      @refused did you already verified this layout?

      Delete
  2. Ben Spinks9 December 2022 at 20:44

    I think it should be a 100pf ceramic too.

    ReplyDelete
    Replies
    1. mirosol11 December 2022 at 15:14

      On GratefulEight trace that is 100p, while it's 10p in Manfred's redrawn schem. 100p seems correct..
      +m

      Delete
    2. Ben Spinks11 December 2022 at 20:05

      Just had a crack at this one but I'm getting nothing so far. Will have a better look tomorrow, but I can't see anything obvious on first inspection.

      Delete
    3. mirosol12 December 2022 at 04:36

      I checked it again and noticed one more flaw. The 4n7 on the recovery input was tied to vref instead of ground. In my understanding that should not prevent the circuit from functioning. But i's fixed now. Try that? And maybe a probe to see where the signal dies?

      Otherwise this *should* be per schematic and since it's pretty basic opamp circuit, it should work..
      +m

      Delete
  3. micadoo4 January 2023 at 09:04

    This comment has been removed by the author.

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  4. micadoo5 January 2023 at 07:31

    Should the cut underneath the 22uf cap be there? Looking at the Pedal PCB Tellurian drive schematic, it looks like pin 7 of the op amp should be connected to the 680nf cap to volume? Apologies if I'm missing something. Thanks M

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    Replies
    1. mirosol5 January 2023 at 10:08

      No! That cut should not be there. Thanks for the heads up!
      i'll fix the layout today.
      +m

      Delete
    2. mirosol5 January 2023 at 11:36

      Now fixed. I bet Ben Spinks' build will come to life if the top right cut on the incorrect version gets shorted...
      +m

      Delete
    3. Ben Spinks5 January 2023 at 17:01

      Yep, very well spotted micadoo. Works fine now, and a cool sounding circuit it is too!

      Delete
    4. mirosol5 January 2023 at 17:56

      Nice!
      Can't believe i did't catch that one myself when i double checked it..
      So! Should i tag it?
      +m

      Delete
    5. Ben Spinks5 January 2023 at 18:33

      Yup, go ahead and tag it.

      Delete
    6. Ben Spinks6 January 2023 at 21:20

      Also, I used a TL072 as the IC and D9E's for the Ge's. It's a surprising pedal now i've got it boxed. Very big range of sounds. From boost to quite heavy lead tones and seriously loud. It's got a certain character that's for sure. Very lively. The only down side for me is that it's *very* bright. 8 - 9 o clock on the tone knob is where i'd normally expect 12 to be.

      Delete
    7. mirosol7 January 2023 at 07:12

      Great! I finally got on a computer and tagged this.

      The tone bot is C50K, so changing that to B or even A taper could make the turn act more like standard tone control. My guess would be that B taper would work better.
      +m

      Delete
    8. Ben Spinks7 January 2023 at 16:14

      The B taper worked perfectly. Much more normal tone control now. Thanks, Ben.

      Delete
  5. Boukman2 May 2024 at 11:44

    Hello everyone! I hope you are all well! I built this and i get no drive out of it and the tone does nothing.. I cannot find anything wrong...Any help? Also i cannot understand how the pot works in the place that it is put.It doesn`t work on any cap as far as the schematic goes...

    ReplyDelete