Wednesday, 24 October 2018

DSM Noisemaker OmniCabSim

A tweakable cabinet simulator for both guitar and bass.
Original FSB thread and still unverified schematic available here.

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32 comments:

  1. Too bad it doesnt include an XLR out and ground lift switches. Is adding such feature a hard thing?(genuine question, not whining)

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  2. Also, does this replace the need for impulse response when recording guitar direct in the DAW?

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    1. A cabsim is theoretically designed to mimic the EQ response of a guitar cabinet, so I'd say yes, it replaces the need for a cab impulse response (unless you wanna go Scholz on your guitar sound :)).

      As for the 1st question, if I wanted to add a balanced output, I'd probably check the H&K Red Box schematic and try to adapt it to this one... Or build the GGG passive direct box in the same enclosure.

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    2. Wow, that simple passive direct box REALLY is simple.

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    3. For the red box:
      https://effectslayouts.blogspot.com/2018/10/hughes-kettner-red-box-mk-ii.html?showComment=1540468734020#c7991046569522358586
      or the source:
      https://i.postimg.cc/TwnqbWnb/H-K-Red-Box-2-schem.png

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    4. For what it's worth, the Red Box 2's cab sim mixed with another's (GE200 IR's, Joyo American, etc.) did not sound good to my ears. It kind of added a "blanket" to the tone.

      I'd recommend building some of the DIs that are in the tagboard forum or google "Tataylino" and check out his simple DIs. Easy and sounds good to me. I use those almost exclusively now.

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    5. So you guys recommend the passive DI's? Where the heck to I get a 10K:600 transformer?!

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    6. Keep it simple: http://tataylino.com/simple-di-box/

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    7. Yes, but aint a passive DI with a transformer even more simple?

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    8. Sure! Then again, the transformer is more expensive than the parts for the active one. Also it might be a bit bitter to fit in the same box.

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    9. Dilemas of a pedal builder....

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  3. I've got the Multicab sim on vero waiting to be tested... now I'll have to try the Omni...

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  4. I see here one OpAmp has been eliminated comparing to schematic at freestomp///org (7 at site VS 6 on vero)

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    1. I am guess the missing OPamp was responsible for the DI's XLR output.

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    2. I do not think so. The opamp that is removed is the one after the first opamp/buffer (U1.2 incl. the 47k/1M to Vb). Would be a weird place to put a XLR out. More likely the line input.

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  5. I got this one on my breadboard in a working state. I think the mids should me A10k and not A100k. Also I think that the gainpot pinout is reversed (yes it is conform schematic, but I think there is a mistake there). I am still experimenting as I am not familiar with this effect and I am not sure it is working 100%. I will report back as soon as I A/B it with the videos that are online.

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    1. Ok, all pins are reversed, so swap all pin 1 with pin 3. Also, I prefer a B100k for gain instead of the A100k.

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    2. Thanks Arnold. Would you call it verified after inverting the pots?

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  6. For clarification, in the schematic the circle on the pots indicates Pin 3 (CW) so they are correct now. I learned that the dot/circle indicates Pin 3 but that could very likely have been wrong (and why i usually use numbers but EasyEDA doesn't have a numbered symbol).

    Also - in the original Mids is definitely 10kA. It may well sound better as 100k (I've taken it off the breadboard now) but the original is 10k.

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    1. Oh, it's bobbass4k (I forgot I use google login for this...)

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  7. This comment has been removed by the author.

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  8. yep verified. Although I think we still need to see if the schematic is really correct. It sucks a lot of distortion/overdrive out of highly distorted/overdriven sounds. If you put a angry charlie in front of it if takes out really a lot of overdrive. @Robert Burton aka bobbass4k, do you have any pedal gutshots left to double check the values? I am willing (and hopefully able) to help!

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    1. The schematic got updated yesterday, so you guys should compare that to the vero.

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    2. Hope it's not too different, I just did all the cuts to start this!

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    3. Interestingly, I had the same thing with a number of cabsims that I've build over the last couple of years.

      The Marshall cabsim over at Sabrotone that I requested nerfs the distortion quite a bit for some reason, but not as much as Joe Davisson's Cabsim. Lart's Simple Cabsim is the best one I've found so far (and actually sounds great).

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  9. Curse you!!! Just finished the build!!! Well, at least I won’t blame myself for it not working.

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  10. I just verified the PCB, not sure what might be different in this particular layout but I'm quite happy with how it turned out. Ran a 'Melter into this, then straight into my audio interface.

    http://www.pedalpcb.com/files/UniCab.jpg

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    1. Certainly not a "demo" by any means, but this is recorded direct.
      https://soundcloud.com/pedalpcb/unicab

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    2. Hi BuGG! The layout matches your schematic. I've put it on hold because of the comments here and on the FSB forum but I'm not sure what the correct sound is supposed to be.

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  11. Any further luck on this for anybody?

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  12. Not sure but Bugg has verified his pcb which matches my layout.

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  13. Ok, i built this and it seems to be working fine. Doesn't seem to be sucking OD/Dist like Arnold noticed. All pots working correctly. Quite liking this, adds loads of headroom to my sound.

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