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I've added the O2 schematic and interactive BOM to the PCBWay project. https://www.pcbway.com/project/shareproject/M2_Guitar_module_for_combo_embedded_projects_0a1b466c.html

I've done ear testing between a real O2 and my O2. Mine is better. Really tight, clear, articulate, beefy... Perfect for the amount of gain it is intended to deliver. BAT48 for Schottky, 2SK208R, J177 and 2N5458 all from mouser. All caps in the signal path are polyester film. All caps in the pf...

I have some extras if you want a PCB for the schematic I posted above, if you're in the US. Shipping cost more than it does to order 10 of them from PCBway if you're outside the US. I can post an interactive BOM for the O2 as well or I can share the schematic and PCB if you want to design your own.

Just verified the O2 drive channel schematic is correct since I have a real O2 now...

Also, these drive channels have another gain stage after the volume prior to going to the output and that is embedded in the cabsim after all the footswitching. The FSB1 connector in my schematic is where the drive output would come from a real pedal. I included it on my PCB but do not use it...

Here's the full schematic for my PCB shown with O2 stuffing option on the board. The PCB was designed for B2/C2/E2/K2/M2 so it has a bodge wire to bypass a gain stage for O2.This board fits in a 125B but is meant as the center piece of a combo pedal with extra 9V feeds to all the other modules...

And, I always have the clean channel in my pedals, so I have the input buffer and a feed to the drive on the PCB plus a feed to other drive channels. The combo pedal has a send/return for alternate drive channels fed by the input buffer and selected with a 3-relay ATtiny board. One of 3 drive...

No, but I always have the cabsim in place which has a buffered output. The schematics at freestompboxs has a mistake in the output buffer. They got the push/pull transistor names reversed. I didn't notice that and built a run of PCBs with the mistake. It was easy to use my PCB by changing the...

The specs are virtually identical between 2sk208r and 2sk118r. Use them... Don't worry about the 2n4558. If you have real ones that are within spec, they'll be fine.

Nice. Can see the impact on amplitude on the yellow trace. I'll do some ear testing on the O2 when my BAT41s arrive.

I have a $5K tektronix scope and the picoscope and I use the picoscope almost exclusively because I'm mostly working on audio stuff. It's perfect for audio. The Tek only get opened up when working with digital stuff using 1MHz or higher clock frequencies. The picoscope is useless up there.

I'll get some BAT41. I've been using BAT48 for all my builds and they all sound really good. I don't like the higher gain pedals like S2 and P2. They sound thrashy/trashy to me. That includes the real pedals, not just my builds. Practice testing last night was with active pups into my pedal...

I don't have the real one in hand yet. This report is from building based on the schematic and using BAT48 for Schottky. But, I will open the real one and trace it to make sure it's accurate. In general, I've found the fewer the gain stages, the more I like the AMT pedals. I don't like anything...

Just had a practice with the O2. It's fantastic. Not as high gain as most AMT pedals. It's really great sounding. Tight. Clear. Not high gain but would be great with with a preboost pedal added. Really impressed with it. It might end up in the center position of my combo pedal.

Yep. I have a spacialist bought from pedalpcb that I've built to play with reverb options.

Just saw this thread and definitely sponsored for $50. I'm still very new to FV-1 and have an idea I want to pursue... The FV-1 can do most all the effects I want on my board. So, I made a PCB with the 8-postion rotary in a small foot print to add to my combo pedal. The idea is to have be "dial...

By the way, read my posts on page 8 of that thread. There are two mistakes in the schematics in the clean channel (mislabled cap) and the cabsim (mislabeled transistors in the push-pull output section. Also, the for proper frequency response, it needs different component values than are used in...

Here's a more direct link. https://www.freestompboxes.org/download/file.php?id=27302

Yep: https://www.freestompboxes.org/viewtopic.php?t=26365&sid=9bde81fa28b5b1c985e3a1a13ea37c44

Just built an O2 per the above schematic. It has one less gain stage than B2/C2/E2/K2/M2. The O2 sounds really good and has a very wide range of gain on the gain control and it greatly affects volume at the same time. This is different than the other pedals that have another gain stage. The gain...