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Certainly not. The first op-amp stage has a voltage gain of about 9X to get instrument level up to line level into the EQ, which has a significant attenuation. Should not be anywhere near clipping. What signal level are you feeding in?

I suggest using some stereo amplifier you already have and test out the scenarios first with the potential speakers and figure out exactly what you like and what you need in a power amp and speaker setup. Then plan out a build...

Yep. The amp is clean and takes line-level input. The Volume-only and TMB preamps are straight out of typical guitar amps to provide the needed gain and EQ that would typically be applied to a guitar signal. But, it's still only a power amp. These are not emulating any kind or preamp. They are...

Added a subfolder with videos of soldering the TPA3118. Link to the upper level folder: https://drive.google.com/drive/folders/1iFa5Fe8ZB1ukfYn8xFxkUt--wFWA6nne?usp=drive_link Description of the process with direct link to the videos... Videos show the process of soldering a TPA3118 to the...

Minor update to the build doc. I changed all the LED resistors that go to 24V to 100k. 47k is too bright for me. But, you might want different. I suggest testing your LEDs at what ever power supply voltage you choose to make sure the brightness is what you want. I don't like blinding pedal LEDs...

Since the cost of shipping from me to anyone outside north America is more than it would cost direct from PCBWay, I've shared the projects there. At the moment, the Volume-Only boards are showing up but not the others. I think they go through some type of review before going live to everyone...

Since there was actual interest in the 3118 board, I've added the schematic, BOM and links to odd-ball parts to the build doc. https://drive.google.com/drive/folders/1iFa5Fe8ZB1ukfYn8xFxkUt--wFWA6nne?usp=drive_link

By the way, I'm willing to sell some of these, too, but it's kinda pointless with the real ones still available for cheap. I've already soldered the 3118 on all 10 of them. I would have to sell each for $6 as they are (no other components), which is already the same price the real ones. So, this...

Build doc updated with a page of links to various parts... https://drive.google.com/drive/folders/1iFa5Fe8ZB1ukfYn8xFxkUt--wFWA6nne?usp=drive_link

All 6 of the preamp variants are here! $2 each plus shipping if anyone wants...

There's really nothing to design. The circuit is right out of the TPA3118 datasheet. So it's just a clone of the boards we've been buying but using thru-hole components. Only did it because... Why not? And I have a very cheap hot plate that gets too hot, so need to work fast...

I know this is climbing a mountain just because it's there but... I don't have to worry about the real boards going extinct now. Soldering the TPA3118 wasn't so hard using solder paste, a hot plate and a USB microscope. (Updated the picture. I can't even follow my own BOM. 680nf caps on the...

The Volume-Only boards all arrived today. Build docs updated again now that I've built one and tested it. I was smarter this time, mounting the pin headers and wires on the back of the board which is much easier when installing in a case...

I've updated the build guide to include all 6 variants so there will only be one master build guide. https://drive.google.com/drive/folders/1iFa5Fe8ZB1ukfYn8xFxkUt--wFWA6nne?usp=drive_link

Build guide for TMB version is complete. I've gone through one full build and documented what was done... Feedback welcome. Anyone want a PCB? The rest of the variants should be here any day now. The build guide, Arduino sketch and graphics are all posted here...

Those are both suitable and would run at 24V if you choose proper electrolytic caps and increase the value of resistors driving LEDs.

The buffer board is a source-follower circuit. It's only option is unity gain. It's of no value. The line-output of the HX stomp can drive the TPA3118 directly. But, I would still suggest building something a bit more versatile.

Just because 8-ohm seems to be a sweet spot for this amplifier. Perfect amount of power for gigs and sounds really nice when paired with the right preamp pedal (such as AMT Legend series 2). The preamp is very important, of course. EDIT: I have been using one of these for gigs for a couple...

I've posted the beginning of a build guide and Arduino sketch file to google drive for the TMB+Digispark version of the board. Feedback welcome. It's not complete but has plenty of pictures of progress on the board and shows the build process. Has almost nothing related to mounting in the 125B...

Yep. You can plug in just about anything. I have 6 different boards coming... They are split into either TMB or Volume only. And then each of those has 3 different methods of soft-touch mute: Digispark; Direct ATtiny chip; or discrete components to implement it. I ordered 10 of each because the...