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Boards came in a few days ago, assembled one and it tested as expected. Web site as a LOT of details and documentation to dig through. I'm happy to answer any questions here, or hit the contact button. I started this project in fall of 2023... because I was annoyed at how expensive a Grace...

I finally got REW, and realized that my very old Presonus Audiobox kinda sucks from a noise (THD) perspective. So I upgraded to a Motu M4, much lower THD. Then I measured my Gamma Acoustic Preamp, it has a THD of 0.013%. I need to borrow some other acoustic preamps to compare. Grace Designs...

I asked this over on AllAboutCircuits. Great thread, especially the Cyril Bateman articles. Also the TI article in post #2 is fantastic. https://forum.allaboutcircuits.com/threads/film-capacitors-for-audio-in-smd.208074/

I love these things, made by Daier: Tayda has 6-7 different options (red, blue, green, purple, red/green, blue/red, momentary, etc) for $3.49. Amplified Parts has something similar with a bigger knob for $8.45. I don't like the big knob or the price. Aliexpress has a 10 pack for $45 shipped...

Tayda Yesterday - DHL: Not terrible, but a far cry from what used to be $20-25 to ship a larger order like this.

Cool. Here's the BOM and cost estimate (minus boards). The part costs don't include shipping (mouser, stompboxparts, Tayda, etc), so factor that in. It's not a cheap build. I could sell the 2 PCB's only or do the whole kit (except enclosure at this point). Google Sheets BOM

Ah, I’ve wondered about THD, I’ll look into REW!

I settled on this for the power section. It seems fine. And using the 2W version has plenty of current capacity, I don't think the 3W is even remotely necessary for my application, about 200mA at 9v. Currently mouser has the 2W for $11 and the 3W for $15 (+tariffs), but the 3W is often out of...

A few years ago I bought a good scope for troubleshooting, a Siglent SDS 804X HD, which is a pretty nice beginner scope for $350-450 (2 vs 4 channels). Probably way more features than I'll ever figure out, but I'm learning. One of the reasons I needed a scope, I'm designing an acoustic preamp &...

A recent picture of this project, a Bode plot of the parametric mid. This version of the PCB is a 4-layer I designed in EasyEDA, much improved over previous version. I made mistakes converting the schematic from Eagle to EasyEDA, fixed them. Now re-printing. Should have the final version here...

I switched from Eagle and Kicad to EasyEDA, it's great. So much easier than Eagle. And as mentioned for SMDA, it is very integrated.

Still have 3 SMD prototypes available. Could sell as a kit or preassembled.

I've built many dozens of pedals over the years, but about 10-20% of them just don't work. Troubleshooting takes so much time, sometimes I do, sometimes I don't want to mess with it and just move on to the next project.

Just in time for the holidays, Full kit $129 No enclosure $117 Free shipping https://www.q-tune.com/ If you’re interested in the SMD version, PM me.

If anyone’s interested in a fully assembled Q-Tune (fully functional) with one of these SMD prototypes, PM me.

I had NO idea you could get thru-hole assembled like SMD.:cool:

Likely the same price as kit, available in 1590b only.

Not too long ago, I wanted to learn SMDA... and I knew Eagle was EOL soon. I knew KiCad some, but my research suggested that EasyEDA integrated to JLC SMDA so much better. So I went with that, and EasyEDA is SO EASY! 3 weeks in, I had learned EasyEDA, SMD, SMDA and had developed a SMDA version...